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OpenStudy (anonymous):
sin 20 .sin 40 .sin80
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OpenStudy (raden):
use this formula : sin(a) * sin(60-a) * sin(60+a) = sin(3a) / 4 set a=20, giving us : sin 20 sin 40 sin80 = sin60/4 = (1/2 sqrt(3)) /4 = 1/8 sqrt(3)
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