7.4   ODE No. 1577

$$\boxed{{\displaystyle f\frac{{\mathrm{d}}^4}{\mathrm{d}{x}^4}y\left(x\right)=0}}$$

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

Mathematica: cpu = 1.265661 (sec), leaf count = 44 $$\left\{\{y(x)\to {\int }_1^x({\int }_1^{K[2]}(\frac{c_1}{f(K[1])}+\frac{c_{2}K[1]}{f(K[1])})dK[1])dK[2]+c_{4}x+c_3\}\right\}$$

Maple: cpu = 0.016 (sec), leaf count = 21 $$\{y\left(x\right)=\frac{\mathit{\_}\mathit{C}\mathit{1}{x}^3}{6}+\frac{\mathit{\_}\mathit{C}\mathit{2}{x}^2}{2}+\mathit{\_}\mathit{C}\mathit{3}x+\mathit{\_}\mathit{C}\mathit{4}\}$$