Cos 255 = cos (210 + 45) = cos 210 cos 45 - sin 210 sin 45 = - cos 30 . cos 45 - (- sin 30) sin 45 = - 1/2 √3 . 1/2 √2 + 1/2 . 1/2 √2
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Cos 255 = cos (210 + 45) = cos 210 cos 45 - sin 210 sin 45 = - cos 30 . cos 45 - (- sin 30) sin 45 = - 1/2 √3 . 1/2 √2 + 1/2 . 1/2 √2