Question

find the partial derivatives

Answer 1

\[a) \frac{ z }{ y }| (1, 1/2) if z= e^{x+2y} \sin y\]
b) fx (pi/3, 1) if f(x, y) = x ln (y cos x)

Answer 2

a) I don't understand, maybe something went wrong with typing in the formula?

b)
You need fx, so consider y as a constant.
e'll need the Product Rule here, and also the Chain Rule...