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    Trigonometric Identities : Calculate cos(3u) in terms of cos(u).

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    Calculate cos(3u) in terms of cos(u).

    © BrainMass Inc. brainmass.com March 4, 2021, 6:14 pm ad1c9bdddf
    https://brainmass.com/math/trigonometry/trigonometric-identities-calculate-cos-terms-cos-36131

    Solution Preview

    cos(2u+u)=

    cos(2u+u) =

    cos(2u)cos(u)-sin(2u)sin(u) ...

    Solution Summary

    Cos(3u) is calculated in terms of cos(u).

    $2.49

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