# Math Help - Functions of Several variables Q

1. ## Functions of Several variables Q

Hey I am stuck on a question, could someone help me out please

the q is in the link

Imageshack - matht.jpg

Best wishes

2. Ive got Imageshack - dxdy.jpg for the first two questions. Are they correct? I dont know how to do the 3rd and 4th parts. also is the denominator corect?

5. So the function is $f(x,y)= \frac{sin(e^x+ y^2)}{\sqrt{x- y}}$ and you are asked to find the first and second partial derivatives with respect to x and y.