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华中师范大学专用
{1:(n {)x=tant
x2
(x2+1)2dx
tan2tsec2=t=
sec4tdt
sin2tdt= 12[1 cos2t]dt
=12[t 1
2
sin2t]=1
2arctanx
x2(x2+1)+C. {2:(©ÜÈ©{)
=
x2d1x+1
= x1
12x+1 x+1d x2
x11
2x2+1+1
2x2+1dx=12arctanx x2(x+1)+C.8
(0.13)
(0.14)