ACOS(3G) [FIXME: manual] ACOS(3G)

# NAME

acos - return the arccosine of the parameter

# DECLARATION

genType acos(genType x);

# PARAMETERS

x
Specify the value whose arccosine to return.

# DESCRIPTION

atan returns the angle whose trigonometric cosine is $x$. The range of values returned by acos is $[0,\pi]$. The result is undefined if $\left| x \right| > 1$.

# VERSION SUPPORT

 OpenGL Shading Language Version Function Name 1.10 1.20 1.30 1.40 1.50 3.30 4.00 4.10 4.20 4.30 4.40 4.50 acos ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔