Re: Trigonometric Identities

Well if the equation doesn't hold true for all values of , then it's not an identity.

It's true for all .

Re: Trigonometric Identities

gah, I suck :(

Just a quick question though, since cot (x/2) = cos (x/2) / sin (x/2) how come you didnt use sin (x/2) as a restriction since it cannot ever be equal to zero?\

thanks in advance

Re: Trigonometric Identities

Quote:

Originally Posted by

**andrew2322** gah, I suck :(

Just a quick question though, since cot (x/2) = cos (x/2) / sin (x/2) how come you didnt use sin (x/2) as a restriction since it cannot ever be equal to zero?\

thanks in advance

This explains:

Quote:

Originally Posted by

**Prove It** Well if the equation doesn't hold true for all values of

, then it's not an identity.

Re: Trigonometric Identities

@mathgirl8:

You have to use [ tex ] ... [ /tex ], not [ tex ] ... [ \tex ]