Polynomial bases
The collection of quadratic polynomials with real coefficients has {1, t, t2} as a basis. Every quadratic polynomial can be written as a1+bt+ct2, that is, as a linear combination of the basis functions 1, t, and t2. The set {(t−1)(t−2)/2, −t(t−2), t(t−1)/2} is another basis for quadratic polynomials, called the Lagrange basis. The first three Chebyshev polynomials form yet another basis