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A Trig Graph You’ve Surely Seen

Here is a graph of $y = \sin(x)$,

You might see the graph of $y = \sin(x)$ as just a shape. But the graph actually represents the behavior of variations along a circle. To see this we must explore the meanings of *y* and *x* in the statement $y = \sin(x)$.

The following sections explore the meanings of *x* and *y* in $y=\sin(x)$, $y=\cos(x)$, and $y=\tan(x)$.

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