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OpenStudy (anonymous):
prove that sin^2A+sin^2(60°+A)+sin^2(60°-A)=3/2
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zepdrix (zepdrix):
Hmmm My guess is that you want to use the additive/substration formulas for sine to break up the 60 and A's. I'm gonna try it and I'll let you know if I get anywhere :)
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