Express tan3x in terms of tanx....
Answer: tanx(3-tan^2x) / 1-3tan^2x
i have used it like sin3x/cos3x and then i use the formula for both.... but then i get stuck in between....
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Express tan3x in terms of tanx. 
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Express tan3x in terms of tanx.
by marty.frmn on Sun Oct 25, 2009 7:29 pm
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by stapel_eliz on Mon Oct 26, 2009 12:09 am
I think you might want to try using a summation formula...? Re-state tan(3x) as tan(x + 2x), and see where that leads.
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