Consider the function f(x) = x* + 2x'. (a) Find the x- and y-intercepts of the graph of f (if any). (b) Find the intervals on which f is increasing or decreasing and the local extreme values (x- and y-coordinates) of f. (c) Find the intervals of concavity and inflection points of f. (d) Sketch the graph of f.

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A: Given,           ∂f∂x=ex-sin(x+y)+cos(x+y), and ∂f∂y=-exsin(x+y).

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A: According to guidelines we solve one question.

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