Calculation: (1-(1/(2**2)))(1-(1/(3**2)))…(1-(1/(2012**2)))(1-(1 /(2013**2)))
计算：(1-(1/(2**2)))(1-(1/(3**2)))…(1-(1/(2012**2)))(1-(1/(2013**2)))
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2_014 / 2_013</gadget>
<output>2_014/2_013 = around 1.000497</output>

<gadget id="calculator">(1/2) * (2_014/2_013)</gadget>
<output>1_007/2_013 = around 0.500248</output>

<result>1_007/2_013 = around 0.500248</result>