2015-04-17 04:52:51 +00:00
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## Acos
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Return the arccosine of the parameter
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2015-04-18 14:41:34 +00:00
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### Declaration
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```glsl
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float acos(float x)
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vec2 acos(vec2 x)
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vec3 acos(vec3 x)
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vec4 acos(vec4 x)
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```
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### Parameters
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2015-04-18 14:41:34 +00:00
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```x``` specify the value whose arccosine to return.
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2015-04-17 04:52:51 +00:00
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### Description
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```acos()``` returns the angle whose trigonometric cosine is ```x```.
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<div class="simpleFunction" data="y = acos(x); "></div>
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### See Also
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2017-08-19 10:11:58 +00:00
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[cos()](/glossary/?search=cos), [sin()](/glossary/?search=sin), [asin()](/glossary/?search=asin), [tan()](/glossary/?search=tan), [atan()](/glossary/?search=atan), [Chapter 05: Shaping Functions](/05/)
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