Cos(90) = 0 çünkü kosinüs fonksiyonu, 90 derecelik açıda komşu kenarın hipotenüse oranı olarak tanımlanır ve bu durumda komşu kenar etkisiz hale gelir.
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.
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