Cosine definition. In a right triangle ABC the sine of α, sin(α) is defined as the ratio betwween the side adjacent to angle α and the side opposite to the right angle (hypotenuse): cos α = b / c.\begin{align} \cos{x} \end{align}.косинус. (cos x {\displaystyle \cos x}.
Таблица косинусов | cos(x)
Тригонометрические функции — Википедия
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