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    Applying Trigonometric Identities

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    Which of the following is identical to cos 5x cos 3x + sin 3x sin 5x?

    cos 2x

    cos 8x

    sin 2x

    sin 8x

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    https://brainmass.com/math/trigonometry/applying-trigonometric-identities-102822

    Solution Summary

    A trigonometric identity is applied.

    $2.19