Numeric

📘 Numeric Extensions

Factorial

int result = 5.Factorial(); // 120

Root Finding (Newton–Raphson) — $x_{n+1} = x_n - \frac{f(x_n)}{f'(x_n)}$

Func<double, double> func = x => Math.Pow(x, 2) - 4;
double root = func.NewtonRaphson(); // 2

---

🔢 Number Theory

bool prime = 79.IsPrime();                  // true
int[] factors = 78.GetPrimeFactors();       // [2, 3, 13]
bool happy = 19.IsHappy();                  // true
bool perfect = 6.IsPerfectNumber();         // true
int decimals = 0.01.GetDecimalPlaces();     // 2

---

📐 Trigonometry

double rad = 180.0.DegreeToRadians(); // π