i think i found the solution http://math.stackexchange.com/questions/59526/symmetry-with-respect-to-the-x-axis-and-the-y-axis http://math.stackexchange.com/ques

i think i found the solution http://math.stackexchange.com/questions/59526/symmetry-with-respect-to-the-x-axis-and-the-y-axis http://math.stackexchange.com/questions/59526/symmetry-with-...