how can i prove that identity...tks

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- Nov 24th 2008, 07:03 PMjuanfe_zodiacprove trigonometric identities...
how can i prove that identity...tks

- Nov 25th 2008, 08:35 AMskeeter

- Nov 25th 2008, 06:44 PMjuanfe_zodiac

can u explain me what did you do in that step? i didnt get that one...

why didnt you use

i know that we want that 3 but can we add terms just like that? - Nov 25th 2008, 07:13 PMskeeter

**can u explain me what did you do in that step? i didnt get that one...**

I needed the middle term so that I could factor the ... to compensate adding it, I also had to also subtract it, resulting in the term.

**why didnt you use**

why do that? it won't factor.

**i know that we want that 3 but can we add terms just like that?**

sure can ... isn't ? - Nov 25th 2008, 07:15 PMjuanfe_zodiac