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Mathematics, 21.02.2020 17:53 alissa3329

Compute the directional derivatives of the following functions along unit vectors at the indicated points in directions parallel to the given vector.
(a) f(x, y) = xy, (x0, y0) = (e, e), d = 20i + 21j
(b) f(x, y, z) = ex + yz, (x0, y0, z0) = (1, 1, 1), d = (3, −5, 5

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