Calculation: (1-(1/2)*(1/2))*(1-(1/3)*(1/3))*(1-(1/4)*(1/4))* ...*(1-(1/2014)*(1/2014)).
计算：(1-(1/2)*(1/2))*(1-(1/3)*(1/3))*(1-(1/4)*(1/4))*…*(1-(1/2014)*(1/2014))．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2_015 / 2_014</gadget>
<output>2_015/2_014 = around 1.000497</output>

<gadget id="calculator">(1/2) * (2_015/2_014)</gadget>
<output>2_015/4_028 = around 0.500248</output>

<result>2_015/4_028 = around 0.500248</result>