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Use a half-angle identity cos open parentheses theta over 2 close parentheses equals plus-or-minus square root of fraction numerator 1 plus cos theta over denominator

Use a half-angle identity cos open parentheses theta over 2 close parentheses equals plus-or-minus square root of fraction numerator 1 plus cos theta over denominator 2 end fraction end root to find the exact value of cos open parentheses fraction numerator 17 straight pi over denominator 12 end fraction close parentheses

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