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September 19, 2014

September 19, 2014

Posted by **tony** on Tuesday, July 16, 2013 at 12:36pm.

csc^2 x sec x / sec^2 x + csc^2 x

- trig -
**Steve**, Tuesday, July 16, 2013 at 2:26pmsec^2 + csc^2 = 1/cos^2 + 1/sin^2 = (sin^2+cos^2)/(sin^2 cos^2) = 1/(sin^2 cos^2)

csc^2 sec = 1/(sin^2 cos) = cos/(sin^2 cos^2)

so , doing the division, we end up with just

cos x

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