Posted by Emmie on Wednesday, February 15, 2012 at 9:45pm.
sort of like rationalizing radical expressions, multiply top and bottom by (1+cosX), giving
(1+cosX)^2
-------------
(1-cos^2X
= (1+cosX)^2/sin^2X
= [(1+cosX)/sinX]^2
= (cscX + cotX)^2
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