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April 18, 2015

April 18, 2015

Posted by **Sierra** on Thursday, July 12, 2012 at 10:51am.

- trig -
**Reiny**, Thursday, July 12, 2012 at 1:05pmcos^2t+2cos(t)+1=0

(cost + 1)^2 = 0

cost + 1 = 0

cost = -1

t = 270°

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