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Let f be a function differentiable on R (all real numbers). Let y1 and y2 be...

Let f be a function differentiable on R (all real numbers). Let y1 and y2 be pair of numbers (y1 < y2) with the property f(y1) = y2 and f(y2) = y1. Show there exists a num where the value of f' is -1. Name all theroms that you use and explain each step.

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