Darboux's Theorem for Derivatives

Rarely Tested

Darboux's Theorem for Derivatives

If $$f$$ is differentiable on an interval and:

$$f'(a)<k<f'(b)$$

then there exists some $$c\in(a,b)$$ such that:

$$f'(c)=k$$

Usage

- Used in advanced problems involving the intermediate values of derivatives.

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