👉 In mathematics, a non-derivable function is a function that does not have a direct derivative. This means that there exists no explicit formula for its derivative with respect to any variable, and thus it cannot be used as an approximation or calculation tool. For example, consider the function f(x) = x^2 - 1. If we want to find the derivative of this function with respect to x, we can use the power rule: f'(x) = d/dx (x
