is $M=\{ (\cos t,\cos2t):t\in \mathbb{R}\}$ a differential manifold
I know that for small intervals is manifold(is a parabola), but in all $\mathbb{R}$ i dont know
is $M=\{ (\cos t,\cos2t):t\in \mathbb{R}\}$ a differential manifold
I know that for small intervals is manifold(is a parabola), but in all $\mathbb{R}$ i dont know