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    Double angle formula

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    Please prove the following identity without using the quotient identity:
    sin(2x)/cos(2x) = 2tan(x)/1-tan²(x)

    I need to use the double angle formulas for sine and cosine.

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    https://brainmass.com/math/geometry-and-topology/double-angle-formula-21482

    Solution Summary

    This solution shows how to prove the identity of sin(2x)/cos(2x) = 2tan(x)/1-tan²(x) using double angle formulas.

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