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Given the function f(x, y, z) = (x2 + y2 + z2 )−1/2 a) what is...

Given the function f(x, y, z) = (x2 + y2 + z2 )−1/2

a) what is the gradient at the point (12,0,16)?

b) what is the directional derivative of f in the direction of the vector u = (1,1,1) at the point (12,0,16)?

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