Find the eigenfunctions and the equation that defines the eigenvalues for the given boundary-value problem. Use a CAS to approximate the first four eigenvalues , 22, 23, and 24. (Round your answers to four decimal places.) y"+2y= 0, y'(0) = 0, y(1) + y'(1) = 0 21 == 2+2 = 23 = 24 Give the eigenfunctions corresponding to these approximations. (Select the eigenfunction that satisfies y(0) = 1. Round all constants to four decimal places.) Y(x) = Y2(x) = Y3(x) = Y4(x) =