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How does the Geometer's Sketchpad drag points to change the value of parameter A?
1, draw any point on a straight line, measure the point value of this point, and change the label to a;

2. Edit the function. When you need to introduce a value, click the measured value of A in this area.

3. Move the point on the straight line, A will change, and the function expression and image will also change.

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