Sin(30) ve cos(60) aynı değere sahiptir, çünkü sin(30) ifadesi 60 derecelik açının kosinüs fonksiyonuna eşittir. Bu sonuç, aşağıdaki eşitlikten çıkarılabilir: sin(90° - x) = cos x. Buna göre, sin(30°) = sin(90° - 30°) = cos 60° = 0,5.
Cos(90) = 0 çünkü kosinüs fonksiyonu, 90 derecelik açıda komşu kenarın hipotenüse oranı olarak tanımlanır ve bu durumda komşu kenar etkisiz hale gelir.
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