(1-1/2^2)*(1-1/3^2)*(1-1/4^2)*···*(1-1/2011^2)

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(1-1/2^2)*(1-1/3^2)*(1-1/4^2)*···*(1-1/2011^2)

(1-1/2^2)*(1-1/3^2)*(1-1/4^2)*···*(1-1/2011^2)
(1-1/2^2)*(1-1/3^2)*(1-1/4^2)*···*(1-1/2011^2)

(1-1/2^2)*(1-1/3^2)*(1-1/4^2)*···*(1-1/2011^2)
(1-1/2^2)*(1-1/3^2)*(1-1/4^2)*···*(1-1/2011^2)
=(1-1/2)(1+1/2)(1-1/3)(1+1/3)(1-1/4)(1+14)*.*(1-1/2011)(1+1/2011)
=1/2*3/2*2/3*4/3*3/4*5/4*.*2010/2011*2012/2011
=1/2*2012/2011
=1006/2011