=(1/2-1)(1/3-1)*...*(1/10-1)(1/2+1)(1/3+1)*...*(1/10+1)
=(-1/2)*(-2/3)*...*(-9/10)*3/2*4/3*...*11/10
=-11/2*1/10=-11/20
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=(1/2-1)(1/3-1)*...*(1/10-1)(1/2+1)(1/3+1)*...*(1/10+1)
=(-1/2)*(-2/3)*...*(-9/10)*3/2*4/3*...*11/10
=-11/2*1/10=-11/20