cot45°/（tan45°-sin60°）=?

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]