∫xcos(x/2)dx X*(X/2)

问题描述:

∫xcos(x/2)dx X*(X/2)

∫xcos(x/2) dx
= 2∫x d[sin(x/2)]
= 2xsin(x/2) - 2∫sin(x/2) dx
= 2xsin(x/2) + 4cos(x/2) + C
后面那些不知道你写的什么.