4.2   ODE No. 1002

$$\boxed{{\displaystyle \frac{{\mathrm{d}}^2}{\mathrm{d}{x}^2}y\left(x\right)+y\left(x\right)=0}}$$

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

Mathematica: cpu = 0.004000 (sec), leaf count = 16 $$\left\{\{y(x)\to c_2\sin (x)+c_1\cos (x)\}\right\}$$

Maple: cpu = 0.031 (sec), leaf count = 13 $$\{y\left(x\right)=\mathit{\_}\mathit{C}\mathit{1}\sin \left(x\right)+\mathit{\_}\mathit{C}\mathit{2}\cos \left(x\right)\}$$