Tangent and secant lines | Calculus (limits)

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A conceptual description of tangent lines and secant lines, how they differ, and some formulas for computing slopes of secant lines from a point, a ∆x value, and a function.

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0:00 What makes tangent lines so special?
5:14 What's a secant line?
8:17 How are tangent and secant lines different?
9:38 Formulas for slopes
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