Prove that

(Sorry about that. I don't know how to use LaTEX, it's all messed up. I used the MATH tag and it showed an error and so I used the TEX tag).

I don't know where to start. What trig identities should I use?

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- November 6th 2011, 10:59 AMDonTrig proof - how do I prove this?
Prove that

(Sorry about that. I don't know how to use LaTEX, it's all messed up. I used the MATH tag and it showed an error and so I used the TEX tag).

I don't know where to start. What trig identities should I use? - November 6th 2011, 11:15 AMveileenRe: Trig proof - how do I prove this?
Online LaTeX Equation Editor - create, integrate and download it's easier.

Use twice . - November 6th 2011, 11:18 AMOpalgRe: Trig proof - how do I prove this?
- November 7th 2011, 08:22 AMDonRe: Trig proof - how do I prove this?
Got it, thanks.