題組內容
2. Solve the initial value problem for the following second-order ordinary differential equations.
(a) \( (5\%) \) \( y^{\prime \prime} + y = 0,y(0) = 3,y^{\prime}(0) = -0.5 \)
2. Solve the initial value problem for the following second-order ordinary differential equations.
(a) \( (5\%) \) \( y^{\prime \prime} + y = 0,y(0) = 3,y^{\prime}(0) = -0.5 \)