2.691   ODE No. 691

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

$$y^{\prime }(x)=\frac{\frac{1}{2}{x}^3\cos (2y(x))+\frac{x^3}{2}-\frac{1}{2}\sin (2y(x))}{x}$$ ✓ Mathematica : cpu = 0.287078 (sec), leaf count = 21

$$\left\{\{y(x)\to {\tan }^{-1}\left(\frac{x^4+2c_1}{4x}\right)\}\right\}$$ ✓ Maple : cpu = 0.636 (sec), leaf count = 17

$$\{y\left(x\right)=\arctan \left(\frac{x^4+8\mathit{\_}\mathit{C}\mathit{1}}{4x}\right)\}$$