Match the trigonometric expression:
cos^2 [(pi/2) - x] / cos x
Does csc x match with this?
cos(pi/2-x) = sinx
(e.g. cos 70 = sin 20)
[cos^2 (pi/2-x)]/cosx = sin^2 x/cosx
= (sinx/cosx)sinx
= tanxsinx
Don't know what you mean by "match with this"