public static function inverse($p, ...$params) { $x₀ = $params[0]; $γ = $params[1]; Support::checkLimits(self::LIMITS, ['x₀' => $x₀, 'γ' => $γ, 'p' => $p]); $π = \M_PI; return $x₀ + $γ * tan($π * ($p - 0.5)); }