Suppose f is a differentiable function of x and y, and g(r,s)=f(2r-s, s^2-4r). Calculate gr(1, 2) and gr(1, 2)

Home Work Help
1

Suppose f is a differentiable function of x and y, and g(r,s)=f(2r-s, s2-4r). Calculate gr(1, 2) and gr(1, 2)