15.3 a. For the force field F(x, y, z) y In z i + x Inzj + xy k , calculate the work done by F on an object moving along a curve from (1. 1 e)to (1, 2, e2) Evaluate the line integral F dr where C is the curve parameterized by r(t) = (t + snG t) ) i + (t + cos(f t) ) j , 0-t-1 , and F(x,y) = xy i + x"y j b.