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

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- Aug 26th 2007, 09:32 AMpolymerasetrig identity..
Determine the exact values of cos(13pi/12).....

- Aug 26th 2007, 09:43 AMThePerfectHacker
- Aug 26th 2007, 09:44 AMJhevon
- Aug 26th 2007, 12:21 PMred_dog

Now use