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## Acos
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Return the arccosine of the parameter
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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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```x``` specify the value whose arccosine to return.
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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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[cos()](index.html#cos.md), [sin()](index.html#sin.md), [asin()](index.html#asin.md), [tan()](index.html#tan.md), [atan()](index.html#atan.md), [Chapter 05: Shaping Functions](../05/)
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