2.1577   ODE No. 1577

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

$$f^{″}(x)y^{″}(x)+2y^{(3)}(x)f^{\prime }(x)+f(x)y^{(4)}(x)=0$$ ✓ Mathematica : cpu = 1.2502 (sec), leaf count = 39

$$\left\{\{y(x)\to {\int }_1^x({\int }_1^{K[2]}\frac{c_{2}K[1]+c_1}{f(K[1])}dK[1])dK[2]+c_{4}x+c_3\}\right\}$$

✓ Maple : cpu = 0.012 (sec), leaf count = 21

$$\{y\left(x\right)=\frac{x^3\mathit{\_}\mathit{C}\mathit{1}}{6}+\frac{\mathit{\_}\mathit{C}\mathit{2}{x}^2}{2}+\mathit{\_}\mathit{C}\mathit{3}x+\mathit{\_}\mathit{C}\mathit{4}\}$$