Texts:
a) Show that {sin x, cos x} is independent in the vector space F[0,2pi] of functions defined on the interval [0, 2π]. (2 marks)
b) Find the characteristic polynomial, eigenvalues, eigenvectors, and (if possible) an invertible matrix P such that P^(-1)AP is diagonal ([2], [-1], [-4], [-1]) (4 marks)