can someone set me straight on this proof?

tan3A=(3tanA-tan^3)/(1-3tan^2A)

thanks a bunch:)

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- May 12th 2008, 05:24 PMringer123prooof!!
can someone set me straight on this proof?

tan3A=(3tanA-tan^3)/(1-3tan^2A)

thanks a bunch:) - May 12th 2008, 08:00 PMmr fantastic