Sine and Cosine Graph Practice 2

In the graph below, drag points A and B around. Observe the equations.
A is on the midline.
B is at the maximum of the graph.

Hide the equations by clicking on the check boxes.
Drag A and B around.
What is the equation of the graph?
Use both SINE and COSINE to write the equation, then check your answer.

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Steve Phelps, Created with GeoGebra