# Math Help - Total differential

1. ## Total differential

Imageshack - 32201349.png

I have the answer which is :
dz = (2xe
–xy – x2ye–xy)dx – x3e–xydy = xe–xy((2 – xy)dx – x2dy). Can you show me what step exactly do we take in order to get there. Thx

2. Originally Posted by Tron
Imageshack - 32201349.png

I have the answer which is :
dz = (2xe
–xy – x2ye–xy)dx – x3e–xydy = xe–xy((2 – xy)dx – x2dy). Can you show me what step exactly do we take in order to get there. Thx
$\displaystyle z = f(x,y)$

Thus
$dz = f_x(x, y) dx + f_y(x, y) dy$

So what are the partial derivatives?

-Dan