Lemma
MediumIntegrals
Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §5.2 Antiderivatives, #26 · Calculus · Integrals

Draw … so that the area … increases until …, stays constant…

Draw so that the area increases until , stays constant to , and decreases to .

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §5.2 Antiderivatives, #26

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