Sin は，正弦関数であり，三角法における基本関数の一つである．これは， を単位円の円周に沿って 軸から反時計回りに測定されたラジアン角度とすることによって，実数について定義さ
Sin is the sine function, which is one of the basic functions encountered in trigonometry. It is defined for real numbers by letting be a radian angle measured counterclockwise from the axis
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