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Sin60/cos60
1/2√3:1/2
√3
= 2 cos 250° .sin 60°
(cos 310° + cos 310° ) = 2 cos 1/2(310° + 190°) cos 1/2(310° - 190°)
= 2 cos 250° .cos 60°
(sin 310° - sin 190°) / (cos 310° + cos 190°) =
= 2cos 150° sin 60° / 2 cos 150° .cos 60°
= sin 60° / cos 60°
= 1/2 √3 / (1/2)
= √3