Give an example of a nonconstant vector field f with rightwards harpoon with barb upwards on top that has c u r l f with rightwards harpoon with barb upwards on top equals 0 with rightwards harpoon with barb upwards on top and d i v f with rightwards harpoon with barb upwards on top equals 0 . hint: recall that a vector field with c u r l f with rightwards harpoon with barb upwards on top equals 0 with rightwards harpoon with barb upwards on top is conservative, so perhaps pick an easy example of a conservative vector field and make adjustments to get d i v f with rightwards harpoon with barb upwards on top equals 0.