Well guys, I really would appreciate it were someone able to prove to me this:
cos^2x-sin^2x = (1-tan^2x)/(1+tan^2x)
I think the left side equals cos(2x), but I'm not even sure of that! Any help is much appreciated!
Well guys, I really would appreciate it were someone able to prove to me this:
cos^2x-sin^2x = (1-tan^2x)/(1+tan^2x)
I think the left side equals cos(2x), but I'm not even sure of that! Any help is much appreciated!