1. ## sorry one more!!!

I just cant get it.

Trig identities:

4 tan(x) = 2tan(2x)/2-sec^2(x)

2. 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

3. Ill look it over thanks.