Ok so heres the question,

Prove:

1-cos2x-1/2cos^2x=sec^2x

I got this far but i dont know what do after that

1-(2cos^2x-1)-1/2cos^2x

Can ne one help me???

Printable View

- Dec 12th 2007, 04:39 PMzarlock99need help on prooving trig identities!
Ok so heres the question,

Prove:

1-cos2x-1/2cos^2x=sec^2x

I got this far but i dont know what do after that

1-(2cos^2x-1)-1/2cos^2x

Can ne one help me??? - Dec 12th 2007, 05:31 PMzarlock99?????
anyone?????

- Dec 12th 2007, 06:06 PMbrueneboy
do you really mean to the power of 2x ? maybe im not high enough in math yet then

- Dec 12th 2007, 06:16 PMKrizalid
- Dec 12th 2007, 06:20 PMzarlock99Um
- Dec 12th 2007, 06:54 PMbrueneboy
algebraically you can add parenthesis where you need to, also it is hard to tell what is to what power and what is being divided by what, take a picture of it, that might help some of us

- Dec 12th 2007, 07:00 PMzarlock99That better?
- Dec 12th 2007, 07:12 PMbrueneboy
is the first 1 above, below, or just to the left of the rest of the problem?

- Dec 12th 2007, 07:14 PMzarlock99um
Im trying to prove that the Left hand side equals the right hand side, thus all of that has to equal sec^2x

- Dec 13th 2007, 04:12 AMKrizalid