Numerical Methods, Mathematical Analysis, Programming, Functional Analysis.
several trivial examples: if f(x) is a second-degree polynomial, we can use the famous Bhaskara’s formula: to find the two possible roots: a quadratic function if f(x) is the sine function f(x) = sin(ax), then every x such that x = nπ/a for n ∈ ℤ = {…-3, -2, -1, 0, 1, 2, 3, …} is a root: f(x) =