Given the following functional 1 1 + [ 2 (du ) + au du +/- ( bu)" ]dx - ual... dx dx 1 [u] =f where a(x), b(x) and u(0) = 0. c) Assuming a(x) = x, b(x) = 0 and g(x) first order (N=1) approximation of the solution. Solution: (Please show all your calculations): = 2, use the Rayleigh-Ritz method to determine a