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# MA L 7.2 Verifying Trigonometric Identities - PowerPoint PPT Presentation

MA L 7.2 Verifying Trigonometric Identities. Make the left side equal the right. Hints for Proving Identities. Select the more complex side of the = sign to work on. Use double & half-angle formulas is necessary to get all trig functions of the same angle (x)

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### MA L 7.2 Verifying Trigonometric Identities

Make the left side equal the right.

• Select the more complex side of the = sign to work on.

• Use double & half-angle formulas is necessary to get all trig functions of the same angle (x)

• Carry out any algebraic manipulations, such as adding, subtracting, multiplying, or factoring.

• If given rational expressions, get LCD.

• Converting all expressions to sines and cosines is often helpful.

• If working on the left side, constantly refer to the right and see how you can get something on the left to match the right.

• Try Something! Put your pencil to work and get involved. There is usually more than one method. If you find your equation getting further complicated, start over with a new approach.

Here are three KEY techniques:

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