Use Theorem 13.9 to find the directional derivative of the function at P in the direction of the unit vector u = cos i + sin 0 j. f(x, y) = 8x + y P(2,0), 8 = TT : 160

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Q: If ` f(x) = x^4 + 7, g(x) = x - 1 and h(x) = \sqrt(x) `, then ` f(g(h(x))) `= __________________

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A: As per the company rules we are supposed to answer only the first question and rest can be reposted.

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