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OpenStudy (y2o2):
Prove that (cos pi/7)(cos 2pi/7)(cos 4pi/7)=(-1/8)
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OpenStudy (anonymous):
I can prove it via a rectangular-shaped machine called calculator.
OpenStudy (y2o2):
@Physicist.ALI Lol
OpenStudy (anonymous):
I do deserve a medal dude ^_^
OpenStudy (y2o2):
I deserve a "Thank you"
OpenStudy (anonymous):
hahahahaha thanx there
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