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Introduction.
Formulas for sin(A + B) and sin(A - B).
Finding the exact value of sin 165°.
Simplifying using difference identity for sine.
Formulas for tan(A + B) and tan(A - B).
Finding the exact value of tan pi/12.
Verifying a trigonometric identity with the sum identity for sine and cosine.
Finding sin(θ + β), tan(θ + β) and the quadrant of θ + β.
GreeneMath.com
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