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45 lines
874 B
Markdown
45 lines
874 B
Markdown
# Function acos
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Calculate the inverse cosine of a value.
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For matrices, the function is evaluated element wise.
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## Syntax
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```js
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math.acos(x)
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```
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### Parameters
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Parameter | Type | Description
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--------- | ---- | -----------
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`x` | Number | BigNumber Boolean | Complex | Array | Matrix | null | Function input
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### Returns
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Type | Description
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---- | -----------
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Number | BigNumber | Complex | Array | Matrix | The arc cosine of x
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## Examples
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```js
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math.acos(0.5); // returns Number 1.0471975511965979
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math.acos(math.cos(1.5)); // returns Number 1.5
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math.acos(2); // returns Complex 0 + 1.3169578969248166 i
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```
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## See also
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[cos](cos.md),
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[atan](atan.md),
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[asin](asin.md)
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