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PROVE USING IVT. Suppose f is a differentiable function on [s,t] and suppose f'(s) > 0...

PROVE USING IVT. Suppose f is a differentiable function on [s,t] and suppose f'(s) > 0 > f'(t). Then there's a point p in (s,t) where f'(p)=0.

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