Posted by rossi on Friday, November 26, 2010 at 4:33pm.
sin pi/6 = sin 30 deg = 1/2
cos pi/6 = .5 sqrt 3
cos -x = cos x
so
1/4 - .5 sqrt 3 + 3/4
1 - .5 sqrt 3
(2 - sqrt 3 ) / 2
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