∫sin^2 xdx=?

问题描述:

∫sin^2 xdx=?

∫sin^2 xdx
=∫(1-cos2x)/2dx
=∫1/2dx-∫cos2x/2dx
=x/2-1/4∫cos2xd(2x)
=x/2-sin2x/4+C(C是常数)