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    Deriving trigonometric identities.

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    Use trigonometric identities to derive the following identities:
    a.) sin^2x+cos^2x=1
    b.) sin2x=2sinxcosx
    c.) cos2x=cos^2x-sin^2x
    d.) cos2x=2cos^2x-1
    e.) cos2x=1-2sin^2x

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    Solution Summary

    Trigonometric identities are derived.

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