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# Prove a Trigonometric Identity

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

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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