fix a typo

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Ma Chao 2019-10-19 22:47:31 +08:00 committed by GitHub
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@ -13,7 +13,7 @@ vec4 cos(vec4 angle)
```angle``` specify the quantity, in radians, of which to return the cosine.
### Description
```cos()``` returns the trigonometric sine of angle.
```cos()``` returns the trigonometric cosine of angle.
<div class="simpleFunction" data="y = cos(x); "></div>