Geometric sketchpad is suitable for vector analysis, drawing and function drawing of mathematics, plane geometry and physics, and has a wide range of uses. This paper introduces the detailed steps of drawing mathematical trigonometric function images with geometric sketchpad, which beginners can learn.

1. Open the Geometer's Sketchpad and select the new data function command. In the function editing dialog box, select cos under the function drop-down menu, and then select X and+. Then select sin from the function drop-down menu, click X, and click OK, and a function expression will appear in the drawing area.

2. Select the function expression, select the drawing command to draw the function, and we can see the image.