证明 sina^2+sinβ^2-sina^2sinβ^2+cosa^2cosβ^2=1
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证明sin^2a+sin^2β+1>sina*cosa+sina+sinβ
证明 sina^2+sinβ^2-sina^2sinβ^2+cosa^2cosβ^2=1
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证明sinA+sin(A+2π/3)+sin(A-2π/3)=0
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sin(2a+β)/sina-2cos(a+β)=sinβ/sina
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【证明】Sin A+sin B=2Sin 22