Trig Target Practice

On the graph below, drag points A and B around.
Your task is to write a trig equation that will go through points A and B.
Perhaps A and B are consecutive maximums? Perhaps A is a minimum and B is on the midline? Change it up and challenge your self. Try to use both SINE and COSINE equations!

Write down the equation, then enter it in the INPUT line. Start your equation with f(x)=.

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Steve Phelps, Created with GeoGebra