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MA L 7.2 Verifying Trigonometric Identities

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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:

Replacing

Replacing

Using the Quadratic Formula

1=1

Example 3

33

3