∫xf(x^2)f'(x^2)dx=?
问题描述：
∫xf(x^2)f'(x^2)dx=?
答
答案：[f^2(x^2)]/4
提示：∫xf(x^2)f'(x^2)dx=1/2∫f(x^2)f'(x^2)dx^2,然后令下x^2=t即可