(1+2/3)x(1-2/3)x(1+2/5)x(1-2/5)x...x(1+2/99)x(1-2/99)=(1-2/3)x(1+2/3)x(1-2/5)x(1+2/5)x(1-2/7)x(1+2/7)...x(1-2/97)x(1+2/97)x(1-2/99)x(1+2/99)=1/3 x 5/3 x 3/5 x 7/5 x 5/7 x 9/7 ...x 95/97 x 99/97 x 97/9...