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Double-Angle and Half-angle Formulas. Double-Angle Formulas. Finding exact values. Solutions. Solutions. solutions. Develop a formula for sin (3 θ ) in terms of sin θ and cos θ . Establishing Identities. Other variations of double-angle formulas.

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## Double-Angle and Half-angle Formulas

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**Develop a formula for sin (3θ) in terms of sin θ and cos**θ. Establishing Identities**Write an equivalent expression for cos^4θ that does not**involve any powers of sine or cosine greater than 1. Establishing an identity**Find the exact value of cos (15 degrees)**Find the exact value of sin (165 deg) Find the exact value of tan (195 deg) Finding Exact Values**Remember to be careful to check the sign of the cosine of**the angle Remember to look at the quadrant to determine if the final answer is positive or negative Finding Exact Values**Tutorial**Video Help On-line help

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