Posted by David M. on Wednesday, April 28, 2010 at 7:36pm.
well, 7 pi/6 is 180 + 30 degrees
and 7 pi/6 = twice 7 pi/12
we know sin and cos of 7 pi/6
sin 7 pi/6 = -1/2
cos 7 pi/6 = -(1/2)sqrt3
so now you should be able to find the sin of 7 pi/12
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