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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, #22 · Calculus · Derivatives

Construct a function … whose tangent line at … is the same…

Construct a function $y = f (x)$ whose tangent line at $x = 1$ is the same as the secant that meets the curve again at $x = 3$ .

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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, #22

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