Math
posted by Hannah .
Match the trigonometric expression:
cos^2 [(pi/2)  x] / cos x
Does csc x match with this?

Math 
Reiny
cos(pi/2x) = sinx
(e.g. cos 70 = sin 20)
[cos^2 (pi/2x)]/cosx = sin^2 x/cosx
= (sinx/cosx)sinx
= tanxsinx
Don't know what you mean by "match with this"
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