问题描述: 设y=sin(x y),求d²y/dx² 1个回答 分类:数学 2014-10-26 问题解答: 我来补答 y=sin(xy)dy/dx=cos(xy)*y=ycos(xy)d²y/dx²=-ysin(xy)*y=-y²sin(xy) 展开全文阅读