Author: Anonymous

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The period of the sine and cosine functions is °. Their midline is the horizontal line y = , and their amplitude is .   The tangent function has period °. It is undefined at multiples of ° and is increasing on each interval of its domain.

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The reference angle for θ is the angle formed between the side of θ and the .

We put an angle in standard position by placing its vertex at the origin and the side on the .

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We can use angles to describe rotation. Positive angles indicate rotation in the direction; negative angles describe rotation.

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