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How to Draw a Tangent to a Curve in GeoGebra

You can use GeoGebra to find the tangent line to the graph of a function at a given point:

GeoGebra Instruction 1

The Tangent at a Point

1.
Open Algebra View and Graphics View under GeoGebra icon View in GeoGebra icon Menu.
2.
Type the function in Algebra View and press Enter.
3.
Enter the point (x1,y1) in Algebra View and press Enter. Her y1 = f(x1).
4.
Select the tool Tangents GeoGebra icon in the Toolbar, click the point followed by the graph you have made. The equation for the tangent will appear in Algebra View.

Screenshot of GeoGebra containing a parabola and its tangent line through P

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