cos 2x = 2 cos x
I'm supposed to find all the exact solutions(2 of them), algebraically, in radians.
This has to do with double angle identities, but I can't get it to a point where I can factor.
Any help is appreciated...
btw... cos 2x = 1-2sin^2(x) or 2cos^2(x)-1 or cos^2(x)-sin^2(x)
I'm supposed to find all the exact solutions(2 of them), algebraically, in radians.
This has to do with double angle identities, but I can't get it to a point where I can factor.
Any help is appreciated...
btw... cos 2x = 1-2sin^2(x) or 2cos^2(x)-1 or cos^2(x)-sin^2(x)