2.1002   ODE No. 1002

1. Problem in Latex
2. Mathematica input
3. Maple input

$$y^{″}(x)+y(x)=0$$ ✓ Mathematica : cpu = 0.00541125 (sec), leaf count = 16

$$\left\{\{y(x)\to c_2\sin (x)+c_1\cos (x)\}\right\}$$

✓ Maple : cpu = 0.005 (sec), leaf count = 13

$$\{y\left(x\right)=\mathit{\_}\mathit{C}\mathit{1}\sin \left(x\right)+\mathit{\_}\mathit{C}\mathit{2}\cos \left(x\right)\}$$