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    Prove a Trigonometric Identity

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    2tan(X)/1+tan^2(X)=sin2(X)

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    https://brainmass.com/math/trigonometry/prove-a-trigonometric-identity-16799

    Solution Preview

    We start from the left hand side:

    2tan(X)/(1+tan^2(X))= ...

    Solution Summary

    A trigonometric identity is proven.

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