how do you get the derivative of:

$\displaystyle (\frac {1-\sin}{1+\cos})^2$

*hopefully i used the LaTex Does Correctly...

i tried following my teacher in this problem but easily got lost...

y = $\displaystyle 2\sqrt{x-1} \csc^- \sqrt{x}$

and how would i find the normal and tangent line of:

$\displaystyle 2x^2y + 2y^2=x^3 + 1$ at $\displaystyle (-1,1)$?

i know i have to take the derivative of the equation, but then what?