Q3 need accurate solution neat and clear handwriting on a A4 page ..ASAP..thanks

3. Show that the differential form w = ycos(xy) dx + (x cos(xy) - z) dy - ydz is exact, and use this to evaluate (7, 4, 1) y cos(xy) dx + (x cos(ry) - z) dy - ydz. J (0, 1,1)