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January 30, 2015

January 30, 2015

Posted by **Freckles** on Sunday, December 11, 2011 at 10:14pm.

- trig -
**Reiny**, Sunday, December 11, 2011 at 10:33pmcos (3π)

= cos(2π + π) , ----> one rotation plus another π

= cosπ

= -1

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