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<?php
namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig\Trig;
use PhpOffice\PhpSpreadsheet\Calculation\Exception;
use PhpOffice\PhpSpreadsheet\Calculation\MathTrig\Helpers;
class Cotangent
{
/**
* COT.
*
* Returns the cotangent of an angle.
*
* @param float $angle Number
*
* @return float|string The cotangent of the angle
*/
public static function cot($angle)
{
try {
$angle = Helpers::validateNumericNullBool($angle);
} catch (Exception $e) {
return $e->getMessage();
}
return Helpers::verySmallDenominator(cos($angle), sin($angle));
}
/**
* COTH.
*
* Returns the hyperbolic cotangent of an angle.
*
* @param float $angle Number
*
* @return float|string The hyperbolic cotangent of the angle
*/
public static function coth($angle)
{
try {
$angle = Helpers::validateNumericNullBool($angle);
} catch (Exception $e) {
return $e->getMessage();
}
return Helpers::verySmallDenominator(1.0, tanh($angle));
}
/**
* ACOT.
*
* Returns the arccotangent of a number.
*
* @param float $number Number
*
* @return float|string The arccotangent of the number
*/
public static function acot($number)
{
try {
$number = Helpers::validateNumericNullBool($number);
} catch (Exception $e) {
return $e->getMessage();
}
return (M_PI / 2) - atan($number);
}
/**
* ACOTH.
*
* Returns the hyperbolic arccotangent of a number.
*
* @param float $number Number
*
* @return float|string The hyperbolic arccotangent of the number
*/
public static function acoth($number)
{
try {
$number = Helpers::validateNumericNullBool($number);
} catch (Exception $e) {
return $e->getMessage();
}
$result = ($number === 1) ? NAN : (log(($number + 1) / ($number - 1)) / 2);
return Helpers::numberOrNan($result);
}
}