(1/sin10度)—(根号3/sin80度)=
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![(1/sin10度)—(根号3/sin80度)=](/uploads/image/z/1344649-49-9.jpg?t=%EF%BC%881%2Fsin10%E5%BA%A6%EF%BC%89%E2%80%94%EF%BC%88%E6%A0%B9%E5%8F%B73%2Fsin80%E5%BA%A6%EF%BC%89%3D)
(1/sin10度)—(根号3/sin80度)=
(1/sin10度)—(根号3/sin80度)=
(1/sin10度)—(根号3/sin80度)=
1/sin10-sqrt(3)/sin80
=(cos10-sqrt(3)*sin10)/(cos10*sin10)
=4*(cos60*cos10-sin60*sin10)/sin20
=4*cos70/sin20
=4