Question 1012593
From
(1/ cot(x)) - (sec (x)/csc(x)) = cos (x)
let's express everything in sines and cosines...
(1/(cos/sin) - (1/cos / 1/sin) = cos
sin(x)/cos(x) - sin(x)/cos(x) = cos x
cos x = 0
x = 90 or 270 degrees or pi/2 or 3pi/2 radians