I just cant get it. Trig identities: 4 tan(x) = 2tan(2x)/2-sec^2(x)

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Originally Posted by xxpl510xx I just cant get it. Trig identities: 4 tan(x) = 2tan(2x)/2-sec^2(x) It would seem the reason you can't do it is that it isn't correct. I ran it through my calculator and it didn't work. -Dan

Ill look it over thanks.