/**
* Returns the arc cosine of a number.
*
* @param float $number
* @return float The arc cosine of a number in radians.
*/
public function acos($number)
{
return (double) $this->executionEngine->acos($number);
}
/**
* Returns the arc cosine of a number.
*
* @param float $number
* @return float The arc cosine of a number in radians.
*/
public function acos($number)
{
return (double) $this->executionEngine->acos($number);
}