The given family of functions is the general solution of the differential equation on the indicated interval. Find a member of the family that is a solution of the initial-value problem. y = c1 + c2 cos(x) + c3 sin(x), (−[infinity], [infinity]); y''' + y' = 0, y(π) = 0, y'(π) = 9, y''(π) = −1