#### Transcript of Free Trigonometry Unit Circle Template

**Trigonometry Unit Circle**

π ϴ Δ δ λ Σ ≠ ± ≈ τ

Prove that sin(105°) = ( sqrt(6) + sqrt(2) ) / 4

Problem and Answer

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

Work Area

sin(105o) = sin(60o + 45o) = sin(60o)cos(45o) + cos(60o) sin(45o)

= (sqrt(3)/2 )(sqrt(2)/2) + (1/2)(sqrt(2)/2)

= ( sqrt(6) + sqrt(2) ) / 4

Q.E.D.

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