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Calculus Help! Determine the sign of fx and fy at each indicated point using the contour diagram of f shown below. (The point P is that in the first quadrant, at a positive x and y value; Q through T are located clockwise from P, so that Q is at a positive x value and negative y, etc.)
a).At point Q,R,S,determine whether fx and fy is postive/negative.
at P Ist quadrant fx and fy positive at Q 4th quadrant Fx=+ Fy=- at R 3rd quadrant Fx=- Fy=- at S 4th Quadrant Fx=- Fy=+
I tried that and it has a least one wrong which i don't know which one!!