Cos(90) = 0 çünkü kosinüs fonksiyonu, 90 derecelik açıda komşu kenarın hipotenüse oranı olarak tanımlanır ve bu durumda komşu kenar etkisiz hale gelir.
Hayır, cos(15) ve sin(75) aynı değerler değildir. Ancak, cos(15) = sin(75) ilişkisi, trigonometrik bir kimlik olan cos(90° - θ) = sin(θ) formülü kullanılarak elde edilebilir.
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