Hi there, I need help proving a trig ident. steps plz,

cos2x=(1-tan^2(x))

..........(1+tan^2(x))

tan^2(x) is tan(x)^2....if u don't understand my writing

Please, any help is appreciated, thanks

Printable View

- December 14th 2007, 12:49 PMcompuwizProving a Trig Identity
Hi there, I need help proving a trig ident. steps plz,

cos2x=__(1-tan^2(x))__

..........(1+tan^2(x))

tan^2(x) is tan(x)^2....if u don't understand my writing

Please, any help is appreciated, thanks - December 14th 2007, 12:58 PMgalactus
You can use the identity:

It'll fall into place. - December 14th 2007, 01:03 PMcompuwiz
thanks so much

- December 14th 2007, 01:44 PMKrizalid