Please use matlab to solve the problem

= = 3. Reduce the following initial-value problem to one involving a first-order linear differential equation system (6 points) y" 1y" + y-y= sect y (0) = 2, y(0) = - 1, y (0) = 1 (a) Please find the corresponding fundamental matrix and solve the above linear differential equation (b) Please find the corresponding ell (c) Please prove the linear differential equation system solution derived using eft will be the same as (b)