can someone set me straight on this proof? tan3A=(3tanA-tan^3)/(1-3tan^2A) thanks a bunch

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Originally Posted by ringer123 can someone set me straight on this proof? tan3A=(3tanA-tan^3)/(1-3tan^2A) thanks a bunch Start from tan (A + 2A) and use the compound angle formula. Replace tan(2A) using the double angle formula. Simplify.

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