设函数y=sin²x+2x,求dy

问题描述:

设函数y=sin²x+2x,求dy

dy=(sin(^2)x + 2x)'dx
=(2sinxcosx+2)dx
=(sin2x+2)dx步骤的话,就是一步么?嗯..就是求个导因为dy=f'(x)dx