原始関数の一覧

本項は、原始関数の一覧（げんしかんすうのいちらん）である。以下、積分定数は C {\displaystyle C} とする。 ∫ 1 a x + b d x = 1 a ln ⁡ | a x + b | + C {\displaystyle \int {\frac {1}{ax+b}}\,dx={\frac {1}{a}}\ln \left|ax+b\right|+C} ∫ x a x + b d x = x a − b a 2 ln ⁡ | a x + b | + C {\displaystyle \int {\frac {x}{ax+b}}\,dx={\frac {x}{a}}-{\frac {b}{a^{2}}}\ln \left|ax+b\right|+C} ∫ x 2 a x + b d x = 1 2 a 3 ( a 2 x 2 − 2 a b x + 2 b 2 ln ⁡ | a x + b | ) + C {\displaystyle \int {\frac {x^{2}}{ax+b}}\,dx={\frac {1}{2a^{3}}}(a^{2}x^{2}-2abx+2b^{2}\ln \left|ax+b\right|)+C} ∫ 1 x ( a x + b ) d x = − 1 b ln ⁡ | a x + b x | + C {\displaystyle \int {\frac {1}{x(ax+b)}}\,dx=-{\frac {1}{b}}\ln \left|{\frac {ax+b}{x}}\right|+C} ∫ 1 x 2 ( a x + b ) d x = a b 2 ln ⁡ | a x + b x | − 1 b x + C {\displaystyle \int {\frac {1}{x^{2}(ax+b)}}\,dx={\frac {a}{b^{2}}}\ln \left|{\frac {ax+b}{x}}\right|-{\frac {1}{bx}}+C} ∫ x a + b x d x = 2 15 b 2 ( 3 b x − 2 a ) ( a + b x ) 3 2 + C {\displaystyle \int x{\sqrt {a+bx}}\,dx={\frac {2}{15b^{2}}}(3bx-2a)(a+bx)^{\frac {3}{2}}+C} ∫ x 2 a + b x d x = 2 105 b 3 ( 15 b 2 x 2 − 12 a b x + 8 a 2 ) ( a + b x ) 3 2 + C {\displaystyle \int x^{2}{\sqrt {a+bx}}\,dx={\frac {2}{105b^{3}}}(15b^{2}x^{2}-12abx+8a^{2})(a+bx)^{\frac {3}{2}}+C} ∫ x n a + b x d x = 2 b ( 2 n + 3 ) x n ( a + b x ) 3 2 − 2 n a b ( 2 n + 3 ) ∫ x n − 1 a + b x d x {\displaystyle \int x^{n}{\sqrt {a+bx}}\,dx={\frac {2}{b(2n+3)}}x^{n}(a+bx)^{\frac {3}{2}}-{\frac {2na}{b(2n+3)}}\int x^{n-1}{\sqrt {a+bx}}dx} ∫ a + b x x d x = 2 a + b x + a ∫ 1 x a + b x d x {\displaystyle \int {\frac {\sqrt {a+bx}}{x}}\,dx=2{\sqrt {a+bx}}+a\int {\frac {1}{x{\sqrt {a+bx}}}}dx} ∫ a + b x x n d x = − 1 a ( n − 1 ) ( a + b x ) 3 2 x n − 1 − ( 2 n − 5 ) b 2 a ( n − 1 ) ∫ a + b x x n − 1 d x , n ≠ 1 {\displaystyle \int {\frac {\sqrt {a+bx}}{x^{n}}}\,dx={\frac {-1}{a(n-1)}}{\frac {(a+bx)^{\frac {3}{2}}}{x^{n-1}}}-{\frac {(2n-5)b}{2a(n-1)}}\int {\frac {\sqrt {a+bx}}{x^{n-1}}}dx,n\neq 1} ∫ 1 x a + b x d x = 1 a ln ⁡ ( a + b x − a a + b x + a ) + C , a > 0 {\displaystyle \int {\frac {1}{x{\sqrt {a+bx}}}}\,dx={\frac {1}{\sqrt {a}}}\ln \left({\frac {{\sqrt {a+bx}}-{\sqrt {a}}}{{\sqrt {a+bx}}+{\sqrt {a}}}}\right)+C,a>0} = 2 − a arctan ⁡ a + b x − a + C , a < 0 {\displaystyle ={\frac {2}{\sqrt {-a}}}\arctan {\sqrt {\frac {a+bx}{-a}}}+C,a<0} ∫ 1 x n a + b x d x = − 1 a ( n − 1 ) a + b x x n − 1 − ( 2 n − 3 ) b 2 a ( n − 1 ) ∫ 1 x n − 1 a + b x d x , n ≠ 1 {\displaystyle \int {\frac {1}{x^{n}{\sqrt {a+bx}}}}\,dx={\frac {-1}{a(n-1)}}{\frac {\sqrt {a+bx}}{x^{n-1}}}-{\frac {(2n-3)b}{2a(n-1)}}\int {\frac {1}{x^{n-1}}}{\sqrt {a+bx}}dx,n\neq 1} ∫ 1 x 2 + α 2 d x = 1 α arctan ⁡ x α + C {\displaystyle \int {\frac {1}{x^{2}+\alpha ^{2}}}\,dx={\frac {1}{\alpha }}\arctan {\frac {x}{\alpha }}+C} ∫ 1 ± x 2 ∓ α 2 d x = 1 2 α ln ⁡ ( x ∓ α ± x + α ) + C {\displaystyle \int {\frac {1}{\pm x^{2}\mp \alpha ^{2}}}\,dx={\frac {1}{2\alpha }}\ln \left({\dfrac {x\mp \alpha }{\pm x+\alpha }}\right)+C} ∫ 1 a x 2 + b d x = 1 a b arctan ⁡ a b x + C {\displaystyle \int {\frac {1}{ax^{2}+b}}\,dx={\frac {1}{\sqrt {ab}}}\arctan {\sqrt {\frac {a}{b}}}x+C} ∫ ( a x 2 + b x + c ) d x = a x 3 3 + b x 2 2 + c x + C {\displaystyle \int (ax^{2}+bx+c)\,dx={\frac {ax^{3}}{3}}+{\frac {bx^{2}}{2}}+cx+C} ∫ a 2 + x 2 d x = 1 2 x a 2 + x 2 + 1 2 a 2 ln ⁡ ( x + a 2 + x 2 ) + C {\displaystyle \int {\sqrt {a^{2}+x^{2}}}\,dx={\frac {1}{2}}x{\sqrt {a^{2}+x^{2}}}+{\frac {1}{2}}a^{2}\ln \left(x+{\sqrt {a^{2}+x^{2}}}\right)+C} ∫ x 2 a 2 + x 2 d x = 1 8 x ( a 2 + 2 x 2 ) a 2 + x 2 − 1 8 a 4 ln ⁡ ( x + a 2 + x 2 ) + C {\displaystyle \int x^{2}{\sqrt {a^{2}+x^{2}}}\,dx={\frac {1}{8}}x(a^{2}+2x^{2}){\sqrt {a^{2}+x^{2}}}-{\frac {1}{8}}a^{4}\ln \left(x+{\sqrt {a^{2}+x^{2}}}\right)+C} ∫ a 2 + x 2 x d x = a 2 + x 2 − a ln ⁡ ( a + a 2 + x 2 x ) + C {\displaystyle \int {\frac {\sqrt {a^{2}+x^{2}}}{x}}\,dx={\sqrt {a^{2}+x^{2}}}-a\ln \left({\frac {a+{\sqrt {a^{2}+x^{2}}}}{x}}\right)+C} ∫ a 2 + x 2 x 2 d x = ln ⁡ ( x + a 2 + x 2 ) − a 2 + x 2 x + C {\displaystyle \int {\frac {\sqrt {a^{2}+x^{2}}}{x^{2}}}\,dx=\ln \left(x+{\sqrt {a^{2}+x^{2}}}\right)-{\frac {\sqrt {a^{2}+x^{2}}}{x}}+C} ∫ 1 a 2 + x 2 d x = ln ⁡ ( x + a 2 + x 2 ) + C {\displaystyle \int {\frac {1}{\sqrt {a^{2}+x^{2}}}}\,dx=\ln \left(x+{\sqrt {a^{2}+x^{2}}}\right)+C} ∫ x 2 a 2 + x 2 d x = 1 2 x a 2 + x 2 − 1 2 a 2 ln ⁡ ( a 2 + x 2 + x ) + C {\displaystyle \int {\frac {x^{2}}{\sqrt {a^{2}+x^{2}}}}\,dx={\frac {1}{2}}x{\sqrt {a^{2}+x^{2}}}-{\frac {1}{2}}a^{2}\ln \left({\sqrt {a^{2}+x^{2}}}+x\right)+C} ∫ 1 x a 2 + x 2 d x = 1 a ln ⁡ ( x a + a 2 + x 2 ) + C {\displaystyle \int {\frac {1}{x{\sqrt {a^{2}+x^{2}}}}}\,dx={\frac {1}{a}}\ln \left({\frac {x}{a+{\sqrt {a^{2}+x^{2}}}}}\right)+C} ∫ 1 x 2 a 2 + x 2 d x = − a 2 + x 2 a 2 x + C {\displaystyle \int {\frac {1}{x^{2}{\sqrt {a^{2}+x^{2}}}}}\,dx=-{\frac {\sqrt {a^{2}+x^{2}}}{a^{2}x}}+C} ∫ 1 x 2 − a 2 d x = ln ⁡ ( x + x 2 − a 2 ) + C {\displaystyle \int {\frac {1}{\sqrt {x^{2}-a^{2}}}}\,dx=\ln \left(x+{\sqrt {x^{2}-a^{2}}}\right)+C} ∫ 1 a 2 − x 2 d x = arcsin ⁡ x a + C = − arccos ⁡ x a + C {\displaystyle \int {\frac {1}{\sqrt {a^{2}-x^{2}}}}\,dx=\arcsin {\frac {x}{a}}+C=-\arccos {\frac {x}{a}}+C} ∫ a 2 − x 2 d x = 1 2 x a 2 − x 2 + a 2 2 arcsin ⁡ x a + C {\displaystyle \int {\sqrt {a^{2}-x^{2}}}\,dx={\frac {1}{2}}x{\sqrt {a^{2}-x^{2}}}+{\frac {a^{2}}{2}}\arcsin {\frac {x}{a}}+C} ∫ x 2 a 2 − x 2 d x = 1 8 x ( 2 x 2 − a 2 ) a 2 − x 2 + 1 8 a 4 arcsin ⁡ x a + C {\displaystyle \int x^{2}{\sqrt {a^{2}-x^{2}}}\,dx={\frac {1}{8}}x(2x^{2}-a^{2}){\sqrt {a^{2}-x^{2}}}+{\frac {1}{8}}a^{4}\arcsin {\frac {x}{a}}+C} ∫ a 2 − x 2 x d x = a 2 − x 2 − a ln ⁡ ( a + a 2 − x 2 x ) + C {\displaystyle \int {\frac {\sqrt {a^{2}-x^{2}}}{x}}\,dx={\sqrt {a^{2}-x^{2}}}-a\ln \left({\frac {a+{\sqrt {a^{2}-x^{2}}}}{x}}\right)+C} ∫ a 2 − x 2 x 2 d x = − a 2 − x 2 x − arcsin ⁡ x a + C {\displaystyle \int {\frac {\sqrt {a^{2}-x^{2}}}{x^{2}}}\,dx=-{\frac {\sqrt {a^{2}-x^{2}}}{x}}-\arcsin {\frac {x}{a}}+C} ∫ 1 x a 2 − x 2 d x = − 1 a ln ⁡ ( a + a 2 − x 2 x ) + C {\displaystyle \int {\frac {1}{x{\sqrt {a^{2}-x^{2}}}}}\,dx=-{\frac {1}{a}}\ln \left({\frac {a+{\sqrt {a^{2}-x^{2}}}}{x}}\right)+C} ∫ x 2 a 2 − x 2 d x = − 1 2 x a 2 − x 2 + 1 2 a 2 arcsin ⁡ x a + C {\displaystyle \int {\frac {x^{2}}{\sqrt {a^{2}-x^{2}}}}\,dx=-{\frac {1}{2}}x{\sqrt {a^{2}-x^{2}}}+{\frac {1}{2}}a^{2}\arcsin {\frac {x}{a}}+C} ∫ 1 x 2 a 2 − x 2 d x = − a 2 − x 2 a 2 x + C {\displaystyle \int {\frac {1}{x^{2}{\sqrt {a^{2}-x^{2}}}}}\,dx=-{\frac {\sqrt {a^{2}-x^{2}}}{a^{2}x}}+C} ∫ d x R = 1 a ln ⁡ ( 2 a R + 2 a x + b ) ( for  a > 0 ) {\displaystyle \int {\frac {dx}{R}}={\frac {1}{\sqrt {a}}}\ln \left(2{\sqrt {a}}R+2ax+b\right)\qquad ({\mbox{for }}a>0)} ∫ d x R = 1 a arsinh ⁡ 2 a x + b 4 a c − b 2 (for  a > 0 ,  4 a c − b 2 > 0 ) {\displaystyle \int {\frac {dx}{R}}={\frac {1}{\sqrt {a}}}\,\operatorname {arsinh} {\frac {2ax+b}{\sqrt {4ac-b^{2}}}}\qquad {\mbox{(for }}a>0{\mbox{, }}4ac-b^{2}>0{\mbox{)}}} ∫ d x R = 1 a ln ⁡ | 2 a x + b | (for  a > 0 ,  4 a c − b 2 = 0 ) {\displaystyle \int {\frac {dx}{R}}={\frac {1}{\sqrt {a}}}\ln |2ax+b|\quad {\mbox{(for }}a>0{\mbox{, }}4ac-b^{2}=0{\mbox{)}}} ∫ d x R = − 1 − a arcsin ⁡ 2 a x + b b 2 − 4 a c (for  a < 0 ,  4 a c − b 2 < 0 ,  ( 2 a x + b ) < b 2 − 4 a c ) {\displaystyle \int {\frac {dx}{R}}=-{\frac {1}{\sqrt {-a}}}\arcsin {\frac {2ax+b}{\sqrt {b^{2}-4ac}}}\qquad {\mbox{(for }}a<0{\mbox{, }}4ac-b^{2}<0{\mbox{, }}\left(2ax+b\right)<{\sqrt {b^{2}-4ac}}{\mbox{)}}} ∫ d x R 3 = 4 a x + 2 b ( 4 a c − b 2 ) R {\displaystyle \int {\frac {dx}{R^{3}}}={\frac {4ax+2b}{(4ac-b^{2})R}}} ∫ d x R 5 = 4 a x + 2 b 3 ( 4 a c − b 2 ) R ( 1 R 2 + 8 a 4 a c − b 2 ) {\displaystyle \int {\frac {dx}{R^{5}}}={\frac {4ax+2b}{3(4ac-b^{2})R}}\left({\frac {1}{R^{2}}}+{\frac {8a}{4ac-b^{2}}}\right)} ∫ d x R 2 n + 1 = 2 ( 2 n − 1 ) ( 4 a c − b 2 ) ( 2 a x + b R 2 n − 1 + 4 a ( n − 1 ) ∫ d x R 2 n − 1 ) {\displaystyle \int {\frac {dx}{R^{2n+1}}}={\frac {2}{(2n-1)(4ac-b^{2})}}\left({\frac {2ax+b}{R^{2n-1}}}+4a(n-1)\int {\frac {dx}{R^{2n-1}}}\right)} ∫ x R d x = R a − b 2 a ∫ d x R {\displaystyle \int {\frac {x}{R}}\;dx={\frac {R}{a}}-{\frac {b}{2a}}\int {\frac {dx}{R}}} ∫ x R 3 d x = − 2 b x + 4 c ( 4 a c − b 2 ) R {\displaystyle \int {\frac {x}{R^{3}}}\;dx=-{\frac {2bx+4c}{(4ac-b^{2})R}}} ∫ x R 2 n + 1 d x = − 1 ( 2 n − 1 ) a R 2 n − 1 − b 2 a ∫ d x R 2 n + 1 {\displaystyle \int {\frac {x}{R^{2n+1}}}\;dx=-{\frac {1}{(2n-1)aR^{2n-1}}}-{\frac {b}{2a}}\int {\frac {dx}{R^{2n+1}}}} ∫ d x x R = − 1 c ln ⁡ ( 2 c R + b x + 2 c x ) {\displaystyle \int {\frac {dx}{xR}}=-{\frac {1}{\sqrt {c}}}\ln \left({\frac {2{\sqrt {c}}R+bx+2c}{x}}\right)} ∫ d x x R = − 1 c arsinh ⁡ ( b x + 2 c | x | 4 a c − b 2 ) {\displaystyle \int {\frac {dx}{xR}}=-{\frac {1}{\sqrt {c}}}\operatorname {arsinh} \left({\frac {bx+2c}{|x|{\sqrt {4ac-b^{2}}}}}\right)} ∫ cos ⁡ x d x = sin ⁡ x + C {\displaystyle \int \cos x\,dx=\sin x+C} ∫ − sin ⁡ x d x = cos ⁡ x + C {\displaystyle \int -\sin x\,dx=\cos x+C} ∫ sec 2 ⁡ x d x = tan ⁡ x + C {\displaystyle \int \sec ^{2}x\,dx=\tan x+C} ∫ − csc 2 ⁡ x d x = cot ⁡ x + C {\displaystyle \int -\csc ^{2}x\,dx=\cot x+C} ∫ sec ⁡ x tan ⁡ x d x = sec ⁡ x + C {\displaystyle \int \sec x\tan x\,dx=\sec x+C} ∫ − csc ⁡ x cot ⁡ x d x = csc ⁡ x + C {\displaystyle \int -\csc x\cot x\,dx=\csc x+C} ∫ tan ⁡ x d x = − ln ⁡ ( cos ⁡ x ) + C {\displaystyle \int \tan x\,dx=-\ln(\cos x)+C} ∫ cot ⁡ x d x = ln ⁡ ( sin ⁡ x ) + C {\displaystyle \int \cot x\,dx=\ln(\sin x)+C} ∫ sec ⁡ x d x = ln ⁡ ( sec ⁡ x + tan ⁡ x ) + C = gd − 1 ⁡ x + C gd − 1 ⁡ x {\displaystyle \int \sec x\,dx=\ln(\sec x+\tan x)+C=\operatorname {gd} ^{-1}x+C\quad \operatorname {gd} ^{-1}x} ：グーデルマン関数の逆関数 ∫ csc ⁡ x d x = − ln ⁡ ( csc ⁡ x + cot ⁡ x ) + C = ln ⁡ ( tan ⁡ x − sin ⁡ x sin ⁡ x tan ⁡ x ) + C {\displaystyle \int \csc x\,dx=-\ln(\csc x+\cot x)+C=\ln \left({\tan x-\sin x \over \sin x\tan x}\right)+C} ∫ sin n ⁡ x d x = − 1 n sin n − 1 ⁡ x cos ⁡ x + n − 1 n ∫ sin n − 2 ⁡ x d x + C ∀ n ≥ 2 {\displaystyle \int \sin ^{n}x\,dx=-{\frac {1}{n}}\sin ^{n-1}x\cos x+{\frac {n-1}{n}}\int \sin ^{n-2}x\,dx+C\quad \forall n\geq 2} ∫ sin 2 ⁡ x d x = x 2 − sin ⁡ 2 x 4 + C {\displaystyle \int \sin ^{2}x\,dx={\frac {x}{2}}-{\frac {\sin {2x}}{4}}+C} ∫ cos n ⁡ x d x = 1 n cos n − 1 ⁡ x sin ⁡ x + n − 1 n ∫ cos n − 2 ⁡ x d x + C ∀ n ≥ 2 {\displaystyle \int \cos ^{n}x\,dx={\frac {1}{n}}\cos ^{n-1}x\sin x+{\frac {n-1}{n}}\int \cos ^{n-2}x\,dx+C\quad \forall n\geq 2} ∫ cos 2 ⁡ x d x = x 2 + sin ⁡ 2 x 4 + C {\displaystyle \int \cos ^{2}x\,dx={\frac {x}{2}}+{\frac {\sin {2x}}{4}}+C} ∫ tan n ⁡ x d x = 1 n − 1 tan n − 1 ⁡ x − ∫ tan n − 2 ⁡ x d x + C ∀ n ≥ 2 {\displaystyle \int \tan ^{n}x\,dx={\frac {1}{n-1}}\tan ^{n-1}x-\int \tan ^{n-2}x\,dx+C\quad \forall n\geq 2} ∫ tan 2 ⁡ x d x = tan ⁡ x − x + C {\displaystyle \int \tan ^{2}x\,dx=\tan x-x+C} ∫ cot n ⁡ x d x = 1 n − 1 cot n − 1 ⁡ x − ∫ cot n − 2 ⁡ x d x + C ∀ n ≥ 2 {\displaystyle \int \cot ^{n}x\,dx={\frac {1}{n-1}}\cot ^{n-1}x-\int \cot ^{n-2}x\,dx+C\quad \forall n\geq 2} ∫ cot 2 ⁡ x d x = − cot ⁡ x − x + C {\displaystyle \int \cot ^{2}x\,dx=-\cot x-x+C} ∫ sec n ⁡ x d x = 1 n − 1 sec n − 2 ⁡ x tan ⁡ x + n − 2 n − 1 ∫ sec n − 2 ⁡ x d x + C ∀ n ≥ 2 {\displaystyle \int \sec ^{n}x\,dx={\frac {1}{n-1}}\sec ^{n-2}x\tan x+{\frac {n-2}{n-1}}\int \sec ^{n-2}x\,dx+C\quad \forall n\geq 2} ∫ csc n ⁡ x d x = − 1 n − 1 csc n − 2 ⁡ x cot ⁡ x + n − 2 n − 1 ∫ csc n − 2 ⁡ x d x + C ∀ n ≥ 2 {\displaystyle \int \csc ^{n}x\,dx=-{\frac {1}{n-1}}\csc ^{n-2}x\cot x+{\frac {n-2}{n-1}}\int \csc ^{n-2}x\,dx+C\quad \forall n\geq 2} ∫ arcsin ⁡ x d x = x arcsin ⁡ x + 1 − x 2 + C {\displaystyle \int \arcsin x\,dx=x\arcsin x+{\sqrt {1-x^{2}}}+C} ∫ arccos ⁡ x d x = x arccos ⁡ x − 1 − x 2 + C {\displaystyle \int \arccos x\,dx=x\arccos x-{\sqrt {1-x^{2}}}+C} ∫ arctan ⁡ x d x = x arctan ⁡ x − ln ⁡ 1 + x 2 + C {\displaystyle \int \arctan x\,dx=x\arctan x-\ln {\sqrt {1+x^{2}}}+C} ∫ arccot ⁡ x d x = x arccot ⁡ x + ln ⁡ 1 + x 2 + C {\displaystyle \int \operatorname {arccot} x\,dx=x\operatorname {arccot} x+\ln {\sqrt {1+x^{2}}}+C} ∫ arcsec ⁡ x d x = x arcsec ⁡ x − ln ⁡ ( x − x 2 − 1 ) + C {\displaystyle \int \operatorname {arcsec} x\,dx=x\operatorname {arcsec} x-\ln(x-{\sqrt {x^{2}-1}})+C} ∫ arccsc ⁡ x d x = x arccsc ⁡ x + ln ⁡ ( x + x 2 − 1 ) + C {\displaystyle \int \operatorname {arccsc} x\,dx=x\operatorname {arccsc} x+\ln(x+{\sqrt {x^{2}-1}})+C} ∫ e x d x = e x + C {\displaystyle \int e^{x}\,dx=e^{x}+C} ∫ α x d x = α x ln ⁡ α + C {\displaystyle \int \alpha ^{x}\,dx={\frac {\alpha ^{x}}{\ln \alpha }}+C} ∫ x e a x d x = 1 a 2 ( a x − 1 ) e a x + C {\displaystyle \int xe^{ax}\,dx={\frac {1}{a^{2}}}(ax-1)e^{ax}+C} ∫ x n e a x d x = 1 a x n e a x − n a ∫ x n − 1 e a x d x {\displaystyle \int x^{n}e^{ax}\,dx={\frac {1}{a}}x^{n}e^{ax}-{\frac {n}{a}}\int x^{n-1}e^{ax}\,dx} ∫ e a x sin ⁡ b x d x = e a x a 2 + b 2 ( a sin ⁡ b x − b cos ⁡ b x ) + C {\displaystyle \int e^{ax}\sin bx\,dx={\frac {e^{ax}}{a^{2}+b^{2}}}(a\sin bx-b\cos bx)+C} ∫ e a x cos ⁡ b x d x = e a x a 2 + b 2 ( a cos ⁡ b x + b sin ⁡ b x ) + C {\displaystyle \int e^{ax}\cos bx\,dx={\frac {e^{ax}}{a^{2}+b^{2}}}(a\cos bx+b\sin bx)+C} ∫ ln ⁡ x d x = x ln ⁡ x − x + C {\displaystyle \int \ln x\,dx=x\ln x-x+C} ∫ log α ⁡ x d x = 1 ln ⁡ α ( x ln ⁡ x − x ) + C {\displaystyle \int \log _{\alpha }x\,dx={\frac {1}{\ln \alpha }}\left({x\ln x-x}\right)+C} ∫ x n ln ⁡ x d x = x n + 1 ( n + 1 ) 2 [ ( n + 1 ) ln ⁡ x − 1 ] + C {\displaystyle \int x^{n}\ln x\,dx={\frac {x^{n+1}}{(n+1)^{2}}}[(n+1)\ln x-1]+C} ∫ 1 x ln ⁡ x d x = ln ⁡ ( ln ⁡ x ) + C {\displaystyle \int {\frac {1}{x\ln {x}}}\,dx=\ln {(\ln {x})}+C} ∫ sinh ⁡ x d x = cosh ⁡ x + C {\displaystyle \int \sinh x\,dx=\cosh x+C} ∫ cosh ⁡ x d x = sinh ⁡ x + C {\displaystyle \int \cosh x\,dx=\sinh x+C} ∫ tanh ⁡ x d x = ln ⁡ ( cosh ⁡ x ) + C {\displaystyle \int \tanh x\,dx=\ln \left(\cosh x\right)+C} ∫ coth ⁡ x d x = ln ⁡ ( sinh ⁡ x ) + C {\displaystyle \int \coth x\,dx=\ln \left(\sinh x\right)+C} ∫ sech   x d x = arcsin ⁡ ( tanh ⁡ x ) + C = arctan ⁡ ( sinh ⁡ x ) + C = gd ⁡ x + C gd ⁡ x {\displaystyle \int {\mbox{sech}}\ x\,dx=\arcsin \left(\tanh x\right)+C=\arctan \left(\sinh x\right)+C=\operatorname {gd} x+C\quad \operatorname {gd} x} ：グーデルマン関数 ∫ csch   x d x = ln ⁡ ( tanh ⁡ x 2 ) + C {\displaystyle \int {\mbox{csch}}\ x\,dx=\ln \left(\tanh {x \over 2}\right)+C} ∫ − ∞ ∞ e − α x 2 d x = π α {\displaystyle \int _{-\infty }^{\infty }e^{-\alpha x^{2}}\,dx={\sqrt {\frac {\pi }{\alpha }}}} ∫ 0 π 2 sin n x d x = ∫ 0 π 2 cos n x d x = { n − 1 n ⋅ n − 3 n − 2 ⋅ ⋯ ⋅ 4 5 ⋅ 2 3 , if  n > 1  and  n  is odd n − 1 n ⋅ n − 3 n − 2 ⋅ ⋯ ⋅ 3 4 ⋅ 1 2 ⋅ π 2 , if  n > 0  and  n  is even {\displaystyle \int _{0}^{\frac {\pi }{2}}{\mbox{sin}}^{n}x\,dx=\int _{0}^{\frac {\pi }{2}}{\mbox{cos}}^{n}x\,dx={\begin{cases}{\frac {n-1}{n}}\cdot {\frac {n-3}{n-2}}\cdot \cdots \cdot {\frac {4}{5}}\cdot {\frac {2}{3}},&{\mbox{if }}n>1{\mbox{ and }}n{\mbox{ is odd}}\\{\frac {n-1}{n}}\cdot {\frac {n-3}{n-2}}\cdot \cdots \cdot {\frac {3}{4}}\cdot {\frac {1}{2}}\cdot {\frac {\pi }{2}},&{\mbox{if }}n>0{\mbox{ and }}n{\mbox{ is even}}\end{cases}}} プロジェクト 数学 ポータル 数学 微分積分学の基礎定理 解析学