Test Academy | Let the f: R → R be defined by f (x) = 2x + cos x, then f has a minimum at x = 3t, has a maximum, at x = 0, is a decreasing function, is an increasing function

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

Options :

has a minimum at x = 3t
has a maximum, at x = 0
is a decreasing function
is an increasing function

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