Determine the exact values of cos(13pi/12).....

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- August 26th 2007, 10:32 AMpolymerasetrig identity..
Determine the exact values of cos(13pi/12).....

- August 26th 2007, 10:43 AMThePerfectHacker
- August 26th 2007, 10:44 AMJhevon
- August 26th 2007, 01:21 PMred_dog

Now use