求定积分∫dx⼀[根号(1+x^2)^3],上限1,下限0.

分母全在根号内。需过程,谢谢!
2024-12-04 14:24:52
推荐回答(1个)
回答1:

令x=tant,dx=(sect)^2dt. x=0时t=0,x=1时,t=π/4,所以

∫(0,1) dx/√[(1+x^2)^3]

=∫(0,π/4) cost dt

=sin(π/4)

=√2/2