Question

求根号下1+x/1-x的不定积分

Answer 1

let
x= siny
dx = cosy dy
∫ √[(1+x)/(1-x)] dx
=∫ (1+x)/√(1-x^2) dx
=∫ (1+siny) dy
= y -cosy + C
=arcsinx - √(1-x^2) + C