7. (20 points) Evaluate the line integral / m + -l- 22 d3 over the straight line segment 0 from (1,2,3) to (0, 1,1). 8. (30 points) First, show that the vector eld F : y sin 2 i+x sin 2 j+33y cos z k satises the conditions necessary for it to be conservative. Second, nd a potential function {LIKE/2) for this eld. Third, evaluate the line integral F - dr. (1,1,0)