双等于号用于比较而不是用于设置值。
The double equal sign is used for comparisons, rather than setting values.
注意你的台阶尺寸随著值增加（大约值双每次）。
Notice how the step size increases as the value increases (values roughly double each time).
返回数值的双曲正弦值。！任意实数！
Returns the hyperbolic sine of a number! Is any real number!
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 !
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 !
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