Question

Match the trigonometric expression:

cos^2 [(pi/2) - x] / cos x

Does csc x match with this?

Answer 1

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"