Returns the arccosine of a number.

返回数字的反余弦值。

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The inverse function of that restricted cosine function is called the arccosine function.

被限定的余弦函数之反函数叫做反余弦函数。

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The inverse function of that restricted cosine function is called the arccosine function.

被限定的余弦函数之反函数叫做反余弦函数。

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