三角函数公式
正弦函数：sin(x) = opposite/hypotenuse 余正弦函数：csc(x) = hypotenuse/opposite 余弦函数：cos(x) = adjacent/hypotenuse 余切函数：cot(x) = adjacent/opposite 正切函数：tan(x) = opposite/adjacent 弦函数：sec(x) = hypotenuse/adjacent
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