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    Precalculus Mathematics for Calculus
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    Exam 7: Analytic Trigonometry
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    Use a Half-Angle Formula to Find the Exact Value Of \cos
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Use a Half-Angle Formula to Find the Exact Value Of \cos

Question 74

Question 74

Essay

Use a half-angle formula to find the exact value of cos⁡(−15∘)\cos \left( - 15 ^ { \circ } \right)cos(−15∘) .

Correct Answer:

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