# A Property Possessed by Every Differentiable Function

by Jingcheng Tong (University of North Florida)

College Mathematics Journal
May, 2004

Subject classification(s): Calculus
Applicable Course(s): 3.1 Mainstream Calculus I | 4.11 Advanced Calc I, II, & Real Analysis

If $$f$$  is differentiable at $$x$$, an interesting relationship exists between the tangent and two secant lines.

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Capsule Course Topic(s): One-Variable Calculus | Differentiation: Definition and Elementary Application