Need steps on how to solve the problem

6. Consider the line integral / (A. B) - J sin yz de-+zz cosyz dy +zy cosyz dz. Show that this integral is independent of path by expressing the integrand as an exact differential of for some function f(z, y, z). Then evaluate /(A, B) when A = (2,3,0) and B - (2, 1, "/2)