乗法的不定和分
∏ x csc  x sin  ( x + 1 ) = C sin  x , {\displaystyle \prod _{x}\csc x\sin(x+1)=C\sin x,}
∏ x sec  x cos  ( x + 1 ) = C cos  x , {\displaystyle \prod _{x}\sec x\cos(x+1)=C\cos x,}
∏ x cot  x tan  ( x + 1 ) = C tan  x , {\displaystyle \prod _{x}\cot x\tan(x+1)=C\tan x,}
∏ x tan  x cot  ( x + 1 ) = C cot  x . {\displaystyle \prod _{x}\tan x\cot(x+1)=C\cot x.}