Question

arclength of s(t)=(cos t, sin t, cos 2t, sin 2t) for t in [0, pi]

Answer 1

compute

\[\int\limits_{0}^{\pi}\|s'(t)\|dt\]

Answer 2

I get \(\pi\sqrt{5}\)

Answer 3

Awesome, it seemed so simple that I thought that I did something wrong