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.
Sin15° ve Cos15° değerlerini bulmak için aşağıdaki yöntemler kullanılabilir: Trigonometrik kimlikler ve açı çıkarma formülleri. Hesaplama araçları. Sin15° ve Cos15° değerlerinin yaklaşık değerleri şu şekildedir: Cos15°: √6 + √2 / 4. Sin15°: √6 - √2 / 4.
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