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GeoGebraGeoGebra Classroom

Derivation of sine

Task

Create an applet with the sine function and graph its derivative through the slope of the tangent in each point.

Explore the construction...

  1. Move point A along the function graph and make a conjecture about the shape of the path of point S, which corresponds to the slope function.          
  2. Turn on the trace of point S. Move point A to check your conjecture. Hint: Right-click point S (MacOS: Ctrl-click, tablet: long tap) and select Show Trace.
  3. Find the equation of the resulting slope function and enter it into the Input Bar using g(x) = ... . Move point A along the graph of function f. If your prediction is correct, the trace of point S will match the graph of your function g.

Instructions

1.Toolbar Image Enter the function f(x) = sin(x).
Toolbar Image Right-Click on the Graphics View and select Graphics... . Select tab xAxis and change the unit to
2.Toolbar Image Create a new point A on function f. Hint: Point A can only be moved along the function.
3.Toolbar ImageCreate tangent g to function f through point A.
4.Toolbar Image Create the slope of tangent g using the Slope tool.
5.Toolbar Image Define point S = (x(A), m). Hint: x(A) gives you the x-coordinate of point A.
6.Toolbar ImageConnect points A and S using a segment.
7.Toolbar ImageTurn on the trace of point S. Hint: Right-click point S (MacOS: Ctrl-click, tablet: long click) and select Show Trace.
8. Right-click (MacOS: Ctrl-click, tablet: long click) point A and choose Animation from the appearing context menu. Hint: An Animation button appears in the lower left corner of the Graphics View. It allows you to either pause or continue an animation.

Try it yourself...