Answer to Question #55791 in Calculus for JOSEPH

Question

2 If f(x,y)=tan^ −1 y/x, find f x.
3 Suppose f(x,y) =x^3 y^ 2 –sin^ 2xcos2y, what is ∂f/∂y?
4 Suppose f(x,y)=sin^2xcosy+xy^ 2, what is ∂f/∂x ?
5 If f(x,y)=x^ 2 y^ 3 –2y^ −2, find f y
6 If f(x,y)=4x^3 –3y^2, find f x