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sin31°=√(1-cos²31°)=√(1-a²) 原式=sin(60°-31°)+sin(180°-31°)/cos(180°-31°) =sin60°cos31°-cos60°sin31°-sin31°/cos31° =√3/2cos31°-sin31°/2-sin31°/cos31° =√3/2*a-√(1-a²)/2-√(1-a²)/a
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