Let y be the function of x satisfying the differential equation y'' \minus{} y \equal{} 2\sin x.
(1) Let y \equal{} e^xu \minus{} \sin x, find the differential equation with which the function u with respect to x satisfies.
(2) If y(0) \equal{} 3,\ y'(0) \equal{} 0, then determine y. calculusintegrationfunctiontrigonometrycalculus computations