(Section 1.11: Limits and Derivatives in Calculus) 1.11.5 Form 4: Variable endpoint (x) and Variable run (h)fx+h()±hx, hare variable • Again, if we let h±0, the corresponding secant lines approach the red tangent linebelow. • The figures are similar to the ones for Form 3, except that xreplaces a. Below, we let happroach 0 Below, we let happroach 0
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