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2 |
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3 | # Function acos
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4 |
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5 | Calculate the inverse cosine of a value.
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6 |
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7 | For matrices, the function is evaluated element wise.
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8 |
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9 |
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10 | ## Syntax
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11 |
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12 | ```js
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13 | math.acos(x)
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14 | ```
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15 |
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16 | ### Parameters
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17 |
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18 | Parameter | Type | Description
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19 | --------- | ---- | -----------
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20 | `x` | number | BigNumber | Complex | Array | Matrix | Function input
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21 |
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22 | ### Returns
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23 |
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24 | Type | Description
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25 | ---- | -----------
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26 | number | BigNumber | Complex | Array | Matrix | The arc cosine of x
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27 |
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28 |
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29 | ## Examples
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30 |
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31 | ```js
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32 | math.acos(0.5) // returns number 1.0471975511965979
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33 | math.acos(math.cos(1.5)) // returns number 1.5
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34 |
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35 | math.acos(2) // returns Complex 0 + 1.3169578969248166 i
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36 | ```
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37 |
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38 |
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39 | ## See also
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40 |
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41 | [cos](cos.md),
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42 | [atan](atan.md),
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43 | [asin](asin.md)
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