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October 1, 2014

October 1, 2014

Posted by **Anonymous** on Friday, March 23, 2012 at 10:57am.

- precal -
**Steve**, Friday, March 23, 2012 at 11:43amsec^4 = (tan^2+1)^2 = tan^4 + 2tan^2 + 1

subtract and voila.

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