Need desperate help in math please help! (Pre-Cal)

1) I need to simplify this expression

(1 - sin^2x)/(sin(x) - csc(x))

2) In how many ways can you answer the questions on an exam that consists of 18 true-false questions

please show all steps and work

really need help with these two problems and concepts have a final tomorrow.

1 - sin²x
------------------
sin(x) - csc(x)


cos²(x)
--------------------- (multiply top and bottom by sin(x))
sin(x) - 1/sin(x)


sin(x) cos²(x)
------------------
sin²(x) - 1

sin(x) cos²(x)
------------------
-cos²(x)

-sin(x)


(2) There are two ways to answer each question. If there are 18 questions, then there are
2*2*2* ... *2 = 2^18 ways to answer all of them.