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 Jan 19 awarded Famous Question Jan 16 awarded Notable Question Mar 22 awarded Popular Question Mar 16 awarded Notable Question Nov 9 awarded Yearling Jul 2 awarded Curious Jun 17 awarded Popular Question Feb 11 awarded Critic Nov 22 awarded Nice Question Nov 9 awarded Yearling Oct 30 awarded Good Question Oct 29 accepted 31,331,3331, 33331,333331,3333331,33333331 are prime Oct 28 awarded Popular Question Oct 28 awarded Nice Question Oct 28 asked 31,331,3331, 33331,333331,3333331,33333331 are prime Jul 22 awarded Notable Question Jul 20 comment How to find the number of intersection for $\rho =\frac{\theta} {2\pi+1}$ and $\rho =\frac {1} {2-\cos\theta}$ $\theta$ can be negative four intersections. Jul 20 answered How to find the number of intersection for $\rho =\frac{\theta} {2\pi+1}$ and $\rho =\frac {1} {2-\cos\theta}$ Jul 20 comment How to find the number of intersection for $\rho =\frac{\theta} {2\pi+1}$ and $\rho =\frac {1} {2-\cos\theta}$ I have little doubt: this formula $\cos{\theta}=2-\dfrac{2\pi+1}{\theta}$ is not equivalent subject conditions , after all, polar coordinates and Cartesian coordinate system is different than one to one. Jul 20 awarded Commentator