Calculate $ $ \int_{C}^{ }\frac{ds}{x^{2}+y^{2}+z^{2}}$ $ Where $ C$ is the first twist of the curve described by $ $ x=\cos(t),y=\sin(t),z=t$ $ I think "the first twist" means the longest interval in which no two points have the same $ x,y$ which happens when $ 0\le t<2\pi$ , so the integral is: $ $ \int_{C}^{Read more