Is this proof valid ?
D Deleted member 4993 Guest Mar 6, 2017 #2 mazen said: View attachment 7774 Click to expand... Please take the photograph with a perpendicular point-of-view with respect to your answer sheet. I cannot read it presently.
mazen said: View attachment 7774 Click to expand... Please take the photograph with a perpendicular point-of-view with respect to your answer sheet. I cannot read it presently.
