cot45°/(tan45°-sin60°)=?
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cot45°/(tan45°-sin60°)=?
cot45°/(tan45°-sin60°)=?
cot45°/(tan45°-sin60°)=?
cot45°/(tan45°-sin60°)
=1/(1-根号3/2)
=2/(2-根号3)
=2(2+根号3)
1/[1-(3^0.5)/2]=4*[1+(3^0.5)/2]
直接代入1/([1- 3^(1/2)/2]