====== acos ======

===== Description =====

Calculate the [[wp>arccosine]] of a cosine value.

===== Function prototype =====

<code>
double acos <double:value>
</code>

===== Arguments =====

^ Name ^ Type ^ Comment ^
| value | double | A cosine value, the arccosine of which is to be calculated. |

===== Return value =====

The arccosine of the cosine value, as a double-precision angle, in radians.


===== Example =====

<code>
echo <zs:RadToDeg <zs:acos 0.5>> // acos of 0.5 should be 60 degrees
</code>

... the output of which is written to the event log by [[plugins:general:zeoscript:reference:functions:echo]] as:

<file>
60
</file>

===== Comments =====

None.

===== See also =====

  * [[plugins:general:zeoscript:reference:functions:sin]]
  * [[plugins:general:zeoscript:reference:functions:cos]]
  * [[plugins:general:zeoscript:reference:functions:tan]]
  * [[plugins:general:zeoscript:reference:functions:asin]]
  * [[plugins:general:zeoscript:reference:functions:atan]]
  * [[plugins:general:zeoscript:reference:functions:DegToRad]]
  * [[plugins:general:zeoscript:reference:functions:RadToDeg]]