(Recommended) Draw a curve that goes up-down-up
(Recommended) Draw a curve that goes up-down-up. Below it draw its derivative. Then draw its second derivative. Mark the same points on all curves—the maximum, minimum, and inflection points of the first curve.
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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §3.3 Second Derivatives: Bending and Acceleration, #46
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