Determining the equation of a trigonometric function

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Determining the amplitude and period of sine and cosine functions.

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Length: 9 minutes

Trigonometric Identities

Length: 9 minutes

Proof: sin(a+b) = (cos a)(sin b) + (sin a)(cos b)

Length: 9 minutes

Proof: cos(a+b) = (cos a)(cos b)-(sin a)(sin b)