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October 1, 2016
Posted by **Melinda** on Sunday, January 29, 2012 at 12:58pm.

Two identities are: sin^2x + cos^2x = 1 and tan2x=2tanx/1-tan^2x

- what is the denominator? -
**Damon**, Sunday, January 29, 2012 at 1:29pm2tanx/(sin^2x) + cos^2x - tan^2x?

or

2tanx/(sin^2x + cos^2x) - tan^2x?

or

2tanx/(sin^2x + cos^2x - tan^2x? )

??????????