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Suppose π / 2 ≤ γ ≤ 3π / 2 and cot⁡ γ = −11 /...

Suppose π / 2 ≤ γ ≤ 3π / 2 and cot⁡ γ = −11 / 15. Evaluate

a) sin⁡(2γ)

b)  cos(y - 7π / 4)

Math   Precalculus   
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