Find a function f such that gradf=(4yz,4xz,4xy-6z) .
f=+K
Use f to evaluate:
∫_C (4yz,4xz,4xy-6z) *dr
where C is the straight line from (0,2,1) to (0,4,5) .
a) 66
b) 72
c) 78
d) 84