(cos10度+√3sin10度)/√(1-cos80度)
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(cos10度+√3sin10度)/√(1-cos80度)
(cos10度+√3sin10度)/√(1-cos80度)
(cos10度+√3sin10度)/√(1-cos80度)
(cos10°+√3sin10°)/√(1-cos80°)
=2sin(10°+30°)/√(1-(1-2sin^2(40°))
=2sin40°/√2sin40°
=√2