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September 30, 2014

September 30, 2014

Posted by **jake** on Monday, April 14, 2008 at 11:23am.

- math/trigonometry -
**bobpursley**, Monday, April 14, 2008 at 11:28ammultipy both sides by cos x/2

sec cos=cos^2

1=cos^2

cos x/2= +-1

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