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Find the directional derivative of the function f(x,y) = (x+1)4cos(-5y) at the point (0,1) in the...

Find the directional derivative of the function f(x,y) = (x+1)4cos(-5y) at the point (0,1) in the direction from the point (3,0) toward the point (6,6).

Also, in what direction does the function have the maximal decrease at the point (3, 0)?

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