In this question, I tried this:
sin^2(180-x) cosec(270+x) + cos^2(360-x) sec(180-x), where cosec(x) = 1/sin(x) and sec(x) = 1/cos(x)
-sin^2(180-x) = sin^2(x) and cos^2(x) = cos^2(x)
-The sin^2 and the 1/sin(x) cancle out along with the cos^2 and the 1/cos(x)
Therefore, I am left with sin(x)(270+x) + cos(x)(180-x)
This looks wrong. The answer on the answer sheet is -sec(x). I ask you for help please.