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sin45°=√2/2sin平方45°=1/2 tan30°=√3/3tan平方30°=1/3 sin平方45°-tan平方30°=1/2-1/3=1/6 2sin平方30°×tan30°+cos60°tan60° =2*(1/2)^2*√3/3+1/2*√3 =√3/6+√3/2 =2√3/3
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