How do you prove tan (2x) = (2tan (x) ) / (1-tan2x) ?

1.	How do you prove tan (2x) = (2tan (x) ) / (1-tan2x) ?
Answer» LHS = 2tan(x) / 1- tan²(x) = (2tan (x) ) / (1-tan2 x) = RHS Prove tan(2x) = 2tan(x)/ 1- tan²(x)

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