设函数f(x,y)可微,=ecoty,求f(x,y).

admin2019-03-12  37

问题 设函数f(x,y)可微,=ecoty,求f(x,y).

选项

答案[*] 由[*] 得C=0,即f(0,y)=siny. 又由[*]=一f(x,y),得lnf(x,y)=一x+lnφ(y). 即f(x,y)=φ(y)e一x,由f(0,y)=siny,得φ(y)=siny,所以f(x,y)=e一xsiny.

解析
转载请注明原文地址:https://jikaoti.com/ti/koBRFFFM
0

最新回复(0)