**Download: Calculus_Derivative.zip**

This sketch shows the tangent line to a function at a moveable point a. The slope of the tangent line is depicted as a length, which reveals the visual connection to the derivative f'(x). As a is moved around, the slope/derivative can be observed with or without tracing. The sketch includes linear, quadratic, cubic, quartic, and sine functions, but the function can be redefined easily on any of the pages.

*Keywords: calculus, derivative, differentiation, slope, gradient, rate*

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