Assertion: trigonometric function's value | /r/HasProperty | xy
Facets:
Source sentences:
text: + tan-1 y = tan-1((x+y)/(1-xy)), if the value xy < 1 14 tan-1
text: x – tan-1 y = tan-1((x-y)/(1+xy)), if the value xy > -1 15 2 tan-1 x = sin-1(2x/(1+x2)), |x| ≤ 1 16 2tan-1 x = cos-1((1-x2)/(1+x2)), x ≥ 0 17 2tan-1