7. Calculate v? f for the following functions
(i) f = exyz
(ii) f = e2x cosh 2y
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4.12 * Calculate the gradient Vf of the following functions, f (x, y, z): (a) f = x2 + 23. (b) f =ky, where k is a constant. (c) f =r= V x2 + y2 + z2. (Hint: Use the chain rule.] (d) f = 1/r.
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