The work done equals

∫c F · dr

= ∫ <xy, 6, 5x> · r'(t) dt

= ∫(t = 0 to π/18) <cos(9t) sin(9t), 6, 45 cos(9t)> · <-9 sin(9t), 9 cos(9t), 1> dt

= ∫(t = 0 to π/18) [-9 sin^2(9t) cos(9t) + 99 cos(9t)] dt

= [(-1/3) sin^3(9t) + 11 sin(9t)] {for t = 0 to π/18}

= 32/3.

I hope this helps!

so integrate F dot dr.......about 0.7 [ units ? ]