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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §2.3 The Slope and the Tangent Line, #18 · Calculus · Derivatives

… can't be tangent to

$y = 4 x$ can't be tangent to $y = c x^{2}$ . Try to match heights and slopes, or draw the curves.

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §2.3 The Slope and the Tangent Line, #18

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