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= 1/4akar3 -1/2akar3
cos 60° = 1/2
sin 60° = 1/2√3
= cos 30° . cos 60° - sin 60°
= 1/2√3 . 1/2 - 1/2√3
= 1/4√3 - 1/2√3
= 1/4√3 - 1/2√3