Question: let f (x) be a continuous function on (-infinity, infinity) for which the following is known: f(-2)=0, f'(c) for c=-4,-1, f(x) is not differentiable at

let f (x) be a continuous function on (-infinity, infinity) for which the following is known: f(-2)=0, f'(c) for c=-4,-1, f(x) is not differentiable at x=2, f'(x)<0 on the interval

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