(a) (b) the direction at which the derivative of f(x, y, z)=2xy + yz at the poin P(1,-1,1) is -4. dy at (0,In 2) if xe + sin(xy)+y-In 2 = 0. dr

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A: According to our guidelines we can answer only one question and rest can be reposted.

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A: Since you have posted multiple questions, we will solve only first question for you. To getremaining…

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