计算数值的双曲余弦值。！任意实数。！
Returns the hyperbolic cosine of a number! Is any real number !
目的研究正弦函数和余弦函数的一些计算公式。
Aim To study some calculation formula of sine function and cosine function.
你知道这仅仅是正弦，余弦和正切的。
And you know this is just what sine, cosine, and tangent are.
必须保持和交通车辆平行，以避免余弦定律产生的错误。
Must be set up absolutely parallel to the traffic flow to avoid "cosine" errors.
必须保持和交通车辆平行，以避免余弦定律产生的错误。
Must be set up absolutely parallel to the traffic flow to avoid "cosine" errors.
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