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.
Hayır, cos 15 ve sin 75 aynı değildir. Ancak, cos 15°'in değeri sin 75°'in değerine eşittir. Bu eşitlik, trigonometrik olarak şu şekilde ifade edilir: cos(15°) = sin(90° - 15°) = sin(75°).
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