Cos150, -√3/2 veya -0,8660254'e eşittir. Bunun sebebi, 150° açısının 90° ile 180° arasında (ikinci bölgede) yer alması ve kosinüs fonksiyonunun ikinci bölgede negatif olmasıdır.
Cos60, 30-60-90 üçgeninde bulunur. Bu üçgende 60 derecenin karşısı a√3 olarak bilinirken, 30 derecenin karşısı a, 90 derecenin karşısı ise 2a olarak ölçülür.
Cos90'ın 0 olmasının nedeni, 90° açısının bir dik üçgende bitişik kenarının etkin bir şekilde yok olmasıdır. Cos90'ın 0 olmasının diğer nedenleri: Birim çember gösterimi. Klasik trigonometri.
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