# example equation which does not have a closed form solution

can you give an example equation which does not have a closed form solution. And when should I suspect that a given equation has no closed form solution? Thanks

• Perhaps something like $x+\sin(x)=1$? Its solution is close to $0.5109734293885691$ – Henry Feb 10 '18 at 10:30
• $x=\cos(x)$ is one of them – Claude Leibovici Feb 10 '18 at 10:35