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January 31, 2015

January 31, 2015

Posted by **Janie** on Sunday, January 24, 2010 at 7:04pm.

- Trig -
**Damon**, Sunday, January 24, 2010 at 7:12pmcos B (2 cos B - 1 )=0

cos B = 0 is one solution. That is at pi/2 and 3pi/2

cos B = 1/2 is also a solution

that is at 60 degrees and -60 degrees which is at pi/3 and 5 pi/3

- Trig -
**Janie**, Sunday, January 24, 2010 at 7:35pmI thought cos=1/2 at 30, not 60

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