when f’(x) = 0 or f’(x) is undefined. x = -1 (horizontal tangent). upward U shape . x = 0 (cusp). upward U shape . Increasing: x < -1 OR -1 < x < 0. downward U shape . Decreasing: x > 0. downward U shape . Slideshow 2744424 by kaia
3.4 derivative and graphs
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What does it mean when a function has its derivative undefined at a point, and how would you find/show this if it were true (in calculus)? - Quora
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Differentiation.pptx