Find the line integral

                     /
                    |  ->     ->
                    |   F dot dr
                    |
                   /
                     C

for C = <e^x cos pi x, e^x sin pi x, x> from 0<=x<= 5 and
for F = <x, y, z> 


F = grad f for f = (x^2+y^2+z^2)/2

the starting point t = 0 is (1,0,0) the end point t = 5 is (-e^5, 0, 5)

so the integral is f(e^5,0,5) - f(1,0,0) = e^10/2 + 12.