Find the directional derivative of at P (2,1,1) in the direction of Q (0,-3,5).
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Mainly question b
(a) Find the directional derivative of f(x,y,z)=xy2tan-1z at (2,1,1) in the direction of v=<1,1,1> .
(b) Find the maximum rate of change of f at this point , and the direction in which it occurs .