4.9   ODE No. 1009

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

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

Mathematica: cpu = 0.004001 (sec), leaf count = 28 $$\left\{\{y(x)\to c_2\sin \left(\sqrt{l}x\right)+c_1\cos \left(\sqrt{l}x\right)\}\right\}$$

Maple: cpu = 0.016 (sec), leaf count = 21 $$\{y\left(x\right)=\mathit{\_}\mathit{C}\mathit{1}\sin \left(\sqrt{l}x\right)+\mathit{\_}\mathit{C}\mathit{2}\cos \left(\sqrt{l}x\right)\}$$