What Steps Are Needed to Solve This Trigonometric Function?

[okh]

Homework Statement

http://img35.imageshack.us/img35/806/imagezxg.jpg

Homework Equations

The Attempt at a Solution

http://img853.imageshack.us/img853/4035/imageyffi.jpg

 

[rock.freak667]

Factor cos^2x-sin^2x and then you can factor out a (sinx-cosx). See if that helps.

 

[okh]

So
http://img52.imageshack.us/img52/2426/imagewrzu.jpg

But they have different factors, how can I factor out (sinx-cosx)?

 

[scurty]

Factor out a -1 out of one of the terms!

 

[Saeed.z]

^

now u can factor :)