I need help with question 1(d) and 2.

1. Evaluate the line integral f f (ds, with f and C as given. 0 a. air) = ysin(sr:) and C is the range of t) = (t,c0st), t E [0, 11']. h. f (it) = 3931? and C is the upper half (y 2 0) of the circle \"it\" = 9. c. air) = .1: + :92 z and C is the triangle with vertices EL = (0,0,1), 5 = (1,1,2) and E = (1,0,0). (1. f (it) = m2 y2 +2: 2+3: +39 and C is the intersection of the cylinder 1:2 +3912 = 1 and the plane (1, 1,1) -i = 2. 2. Let C be the line segment between (a,0,0) and (a. + 1, 1,1), Where a E R is a constant. Find the value of a. if / my zds = 0. c