1. [-/3 Points] DETAILS SCALCCC4 11.6.007.

fix,y)=sin(3x + 3y), F(-9, 9), 1/2(3-1)

(a) Find the gradient of f.

7(x,y)=

(b) Evaluate the gradient at the point P.

(-9, 9)

(c) Find the rate of change of fat P in the direction of the vector u.

D-9, 9) =

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