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47 lines
1.0 KiB
Markdown
47 lines
1.0 KiB
Markdown
# Function cos
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Calculate the 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.cos(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 | Unit | 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 | Cosine of x
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## Examples
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```js
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math.cos(2); // returns Number -0.4161468365471422
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math.cos(math.pi / 4); // returns Number 0.7071067811865475
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math.cos(math.unit(180, 'deg')); // returns Number -1
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math.cos(math.unit(60, 'deg')); // returns Number 0.5
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var angle = 0.2;
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math.pow(math.sin(angle), 2) + math.pow(math.cos(angle), 2); // returns Number ~1
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```
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## See also
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[cos](cos.md),
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[tan](tan.md)
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