Im caught up on this proof... need some help
CosX/SecX+SinX/CscX=Sec^2X-Tan^2X
Think of $\displaystyle secx$ as $\displaystyle \frac{1}{cosx}$ and $\displaystyle cosecx$ as $\displaystyle \frac{1}{sinx}$. when you've got something like
$\displaystyle \frac{cosx}{1/cosx}$ then do you think that this could equate to $\displaystyle cos^2 x$? Does this help you for the rest of the question if you can recall other identities that you need?