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The derivative function

Letting the point of tangency vary turns f' into a function of its own, sketched from the graph of f, with attention to points where it fails to exist.

Active Calculus, The derivative function

Adapted from Active Calculus © 2012–2025 Matthew Boelkins. Licensed under CC BY-SA 4.0. Source: Active Calculus. Imported at revision dc86ba3.