👉 Biannulation, also known as a biannual period or an annual cycle, is a mathematical concept in which a function's output values repeat every two consecutive periods. For example, consider a polynomial function of degree 3 that has zeros at x = -1 and x = 2: f(x) = (x + 1)(x - 2) The function will have its outputs at -1 and 2 as the same value for all values of x in between these two points
