A: f(x,y) = e^(x+y) + cos(xy) / Ln(xy)
b: Sin(x) + cos(y) / 2x - 3y
I'm not exactly sure if I'm doing this correctly, my book a little vague.
The Attempt at a Solution
for A I have when x = -1 and y = any real real number
for B I have when x = 3 and y = 2