# Trigonometric Equations

**Trigonometric equations** involve trigonometric functions that are periodic and therefore their solutions can occur in one or two quadrants and all revolutions.

To solve a **trigonometric equation** make the changes needed to work with only one **trigonometric function**, then if needed, use fundamental trigonometric identities.

#### Examples

Solve the trigonometric equation:

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Divide by 2 and equate each factor to 0.

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