Let C be the boundary of the square with vertices (0,0),(1,0),(1,1) and (0,1) oriented the in the counter clockwise sense. Then the value of the line integral [tex]\oint_ { \rm C} \rm {x}^{2} {y}^{2} dx + ( {x}^{2} - {y}^{2} )dy \\ [/tex] is ________. (rounded of two decimal places)​