how can i use the difference identity to find pi/12, because i keep getting 0 when i try it.

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- March 25th 2011, 01:26 AM #1

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- March 25th 2011, 01:29 AM #2

- March 25th 2011, 01:32 AM #3

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- March 25th 2011, 01:44 AM #4