Chapter 14.2, Problem 25E

Scalar line integrals in ${ℝ}^3$Convert the line integral to an ordinary integral with respect to the parameter and evaluate it.

25.     ${\displaystyle \underset{C}{\int }\left(x+y+z\right)ds;}$ C is the circle $r\left(t\right)=\langle 2\text{ cos }t,02\text{ sin }t\rangle$, for 0 ≤ t ≤ 2π.