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    Working with half-angle identity

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    Cos x (using the half-angle identity)

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    https://brainmass.com/math/geometry-and-topology/working-half-angle-identity-13879

    Solution Preview

    We have the half angle identity for cos x as,
    cos x = +-sqrt[(1 + cos 2x)/2]

    also, cos 7pi/12 = cos ...

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