(1-1/2^2)(1-1/3^2)(1-1/4^2)...(1-1/2009^2)
=(1X3/2^2)(2X4/3^2)(3X5/4^2)...(2008X2010/2009^2)
=1/2X2010/2009
=1005/2009
(1-1/2^2)(1-1/3^2)(1-1/4^2)...(1-1/2009^2)=?
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