9. (10 pts) Let C be the curve in 
defined by the parametric equation
x(t)=cos(t),y(t)=sin(t),z(t)=t
for 0 ≤ t ≤ a. Suppose that the arc length of C is
. Evaluate the line integal 
of the vector field F=
阿摩線上測驗
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阿摩線上測驗
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9. (10 pts) Let C be the curve in defined by the parametric equation
x(t)=cos(t),y(t)=sin(t),z(t)=t
for 0 ≤ t ≤ a. Suppose that the arc length of C is . Evaluate the line integal of the vector field F=