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Find the derivative of the function at P in the direction of A. f(x,y,z) = - 5 ex cos (yz), P (0,0,0), A= i +

Find the derivative of the function at P in the direction of A. f(x,y,z) = - 5 ex cos (yz), P (0,0,0), A= i + 5j + 4k (DA f) (0.0,0) = (Type an exact answer, using radicals as needed.)

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