# How to prove ?

##
Let z=f(x,y) and #ze^z-x^2y=0# .

Prove that #x(delz)/(delx)-y(delz)/(dely)=1-1/(1+z),ifz!=1# .

Let z=f(x,y) and

Prove that

##### 1 Answer

Jun 24, 2018

**Differentials:**

**For the partials:**

#dy = 0#

#dx = 0#

From

Can see the case for