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In the following functions: a) Find the gradient of f. , b) Evaluate the gradient at...

In the following functions: a) Find the gradient of f. , b) Evaluate
the gradient at point P. and
c) Find the rate of change of f in P, in the direction of
vector.

1- f(x. y) = 5xy^2 - 4x^3y, P( I , 2), u = ( 5/13, 12/13 )

2- f(x, y, z) = xe^2yz , P(3, 0, 2), u = (2/3, -2/3, 1/3)

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