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tan60°=√3,cot45°=1,sin60°=√3/2,cos60°=1/2 所以原式=√3-(4*1/2)/(1+2*√3/2) =√3-2/(√3+1) =√3-2*(√3-1)/[(√3-1)(√3+1) =√3-2*(√3-1)/2 =√3-(√3-1) =√3-√3+1 =1
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