(1+1/2)(1+1/2^2)(1+1/2^4)(1+1/2^8)+1/2^15
(1-1/2)(1+1/2)(1+1/2^2)(1+1/2^4)(1+1/2^8)/(1-1/2)
=(1-1/2^16)/(1/2)=2(1-1/2^16)=2-1/2^15
(1+1/2)(1+1/2^2)(1+1/2^4)(1+1/2^8)+1/2^15
=2-1/2^15+1/2^15
=2
(1+1/2)(1+1/2^2)(1+1/2^4)(1+1/2^8)+1/2^15
(1-1/2)(1+1/2)(1+1/2^2)(1+1/2^4)(1+1/2^8)/(1-1/2)
=(1-1/2^16)/(1/2)=2(1-1/2^16)=2-1/2^15
(1+1/2)(1+1/2^2)(1+1/2^4)(1+1/2^8)+1/2^15
=2-1/2^15+1/2^15
=2