If sin A/2 = -12/13

Find Tan A.

I'm really clueless here. The A/2 made it complicated for me that I couldn't get sin A. Help please.

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- October 21st 2009, 07:53 AM #1

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- October 21st 2009, 08:07 AM #2

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- October 21st 2009, 08:12 AM #3

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- October 21st 2009, 08:23 AM #4

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- October 21st 2009, 08:29 AM #5

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