Posted by Amir on Monday, January 23, 2012 at 10:01am.
cot^2 - tan^2
cos^2/sin^2 - sin^2/cos^2
(1 - sin^2)/sin^2 - (1-cos^2)/cos^2
1/sin^2 - 1 - 1/cos^2 + 1
1/sin^2 - 1/cos^2
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