4.91   ODE No. 1091

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

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

Mathematica: cpu = 0.022503 (sec), leaf count = 41 $$\left\{\{y(x)\to c_2\sin (x)+c_1\cos (x)+\frac{1}{2}(\text{Ci}(2x)\sin (x)-\text{Si}(2x)\cos (x)+\log (x)\sin (x))\}\right\}$$

Maple: cpu = 0.031 (sec), leaf count = 35 $$\{y\left(x\right)=\sin \left(x\right)\mathit{\_}\mathit{C}\mathit{2}+\cos \left(x\right)\mathit{\_}\mathit{C}\mathit{1}+\frac{\sin \left(x\right)\mathit{C}\mathit{i}\left(2x\right)}{2}+\frac{\sin \left(x\right)\ln \left(x\right)}{2}-\frac{\mathit{S}\mathit{i}\left(2x\right)\cos \left(x\right)}{2}\}$$