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Let the f : R → R be defined by f (x) = 2x + cosx, then f :

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Let the f : R → R be defined by f (x) = 2x + cosx, then f :

(A) has a minimum at x = π 

(B) has a maximum, at x = 0

(C) is a decreasing function 

(D) is an increasing function

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Answer is (D)

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