urgent help needed! simplifying expressions...

HELP! I'm in Math 12 and have a unit exam soon; the questions on my review all seem to be ones I don't have in my notes and can't understand. A couple I've been struggling with for an hour. Can anyone explain how to do these?

1. sec(-1)-sec(-x)sin*squared*x

So far, I got to:

=sec-1+secxsin*squared*x

=___1____ -1 + __1sin*squared*x__

cosx ************* cosx

=___1___ - __sin*squared*x__

cosx ************* cosx

= __1-cos*squared*x__

cosx

...and now I'm stuck! (Worried) What went wrong?

2. __cos*squared*x__

cot*squared*x

=___-cos*squared*x__

cos *squared*x

= 1

...and, um, that's it. Thx!!!