Trigonometric Functions of Real Numbers

This applet illustrates the definitions of the trigonometric functions with real arguments between

and

. Let

and let the point

be the point on the unit circle corresponding to

. Then

and

. Enter

for the

coordinate of

and

for the

coordinate of

. For example, for the definition of

we will enter

in the input box for

. The applet traces the point

as we drag point

along the unit circle or animate it.

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