y'(x) \left(\sin (\alpha ) \left(y(x)^2-x^2\right)-2 x \cos (\alpha ) y(x)+\sqrt{x^2+y(x)^2} y(x)\right)+\cos (\alpha ) \left(y(x)^2-x^2\right)+2 x \sin (\alpha ) y(x)+x \sqrt{x^2+y(x)^2}=0