Ya.Ya.6 Potential and Solenoid Fields

Condition: Prove that the field \ [\ bar {f} = \ left (\ frac {1} {1+x^} {2}+e^{2 y} \ cos 2 x \ right) i+\ left (\ frac {1}}+e^{2 y}+e}+e} \ sin 2 x \ right) j \] is potential. Find the potential and calculate the work of this field on the way from \ (A (1.2) \) to \ (b (3.4) \).