设f(x,y)=e-xsin(x+2y),则_______.

admin2014-10-21  8

问题 设f(x,y)=e-xsin(x+2y),则_______.

选项

答案-2e-xEsin(x+2y)+cos(x+2y)]

解析 [-e-xsin(x+2y)+e-x.cos(x+2y)]=-e-x.cos(x+2y).2-e-x.sin(x+2y).2=-2e-x[sin(x+2y)+cos(x+2y)].
转载请注明原文地址:https://jikaoti.com/ti/WE2fFFFM
0

最新回复(0)