📌Euler's formula is a fundamental equation in complex analysis that shows a deep connection between exponential functions and trigonometric functions. It states that *e* raised to the power of *i* times *x* equals the cosine of *x* plus *i* times the sine of *x*. In simple terms, it expresses how complex exponentials can represent circular motion. This formula is widely used in engineering, physics, and mathematics because it elegantly links exponential growth, rotation, and wave behavior in a

Number Theory Unit-3 Lesson-2: Number of Divisors (tau) & Sum of Divisors (sigma) Functions