Question

Given w = xy + yz + xz, x = s + t, y = s - t, and z = st. Using the Chain Rule,
Find ∂z/∂s and ∂z/∂t.

Answer 1

is it ∂z/∂s = (y+yz+z)(1+t)+(x+z+xz)(1-t)
∂z/∂t = (y+yz+z)(s+1)+(x+z+xz)(s-1) ?!?! Plz help

Answer 2

right

Answer 3

it is

Answer 4

I am sorry, my knowledge is not enough to help you