Chapter 14.2, Problem 26E

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

26.     ${\displaystyle \underset{C}{\int }\left(x+y+2z\right)ds;}$ C is the circle $r\left(t\right)=\langle 1,3\text{ cos }t,3\text{ sin }t\rangle$, for 0 ≤ t ≤ 2π.