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Question: 15 use the half angle formulas to find the exact...

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15. Use the Half Angle Formulas to find the exact value of cos(157.5) 16. If tan(θ)-12, where <b < π, find the following: a) sin(20) b) cos(20) c) tan(20) d) sin(e/2) e) cos(e/2) f) tan(6/2)
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