1题=S tan^2x sin^2x dtanx=S tan^4x/(1+tan^2x)dtanx
=tan^3x/3-tanx+x+C(C为常数)
2题：令x=sin^2t
原式=S 2tcost dt=2tsint+2cost=2[arcsin(x^0.5)*x^0.5+(1-x)^0.5]
这道数学题怎么做啊,帮帮我吧(S是积分符号)
1题=S tan^2x sin^2x dtanx=S tan^4x/(1+tan^2x)dtanx
=tan^3x/3-tanx+x+C(C为常数)
2题：令x=sin^2t
原式=S 2tcost dt=2tsint+2cost=2[arcsin(x^0.5)*x^0.5+(1-x)^0.5]