Sin(180-x)-cos^2(180 x)/cos(x-270)

Question

Sin(180-x)-cos^2(180 x)/cos(x-270)

Answer 1

sin(180-x) - cos²(180-x)/cos(x-270) = sin x - cos²x / (-sin x) = sin x + cos²x / sin x =

(sin²x + cos²x) / sin x = 1 / sin x