3.691   ODE No. 691

$$\boxed{{\displaystyle \frac{\mathrm{d}}{\mathrm{d}x}y\left(x\right)=1/2\frac{-\sin \left(2y\left(x\right)\right)+\cos \left(2y\left(x\right)\right)x^3+x^3}{x}=0}}$$

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

Mathematica: cpu = 0.080010 (sec), leaf count = 21 $$\left\{\{y(x)\to {\tan }^{-1}\left(\frac{2c_1+x^4}{4x}\right)\}\right\}$$

Maple: cpu = 0.499 (sec), leaf count = 17 $$\{y\left(x\right)=\arctan \left(\frac{x^4+8\mathit{\_}\mathit{C}\mathit{1}}{4x}\right)\}$$