Calculate (1-(1/(2**2)))(1-(1/(3**2)))...(1-(1/(2009**2)))= how much.
计算(1-(1/(2**2)))(1-(1/(3**2)))…(1-(1/(2009**2)))=多少．
<gadget id="calculator">2_009 ** 2</gadget>
<output>4_036_081</output>

<gadget id="calculator">1 / 4_036_081</gadget>
<output>1/4_036_081 = around 0</output>

<gadget id="calculator">1 - (1/4_036_081)</gadget>
<output>4_036_080/4_036_081 = around 1</output>

<gadget id="calculator">(4_036_080/4_036_081) / 2</gadget>
<output>2_018_040/4_036_081 = around 0.5</output>

<gadget id="calculator">2_010 / 2_009</gadget>
<output>2_010/2_009 = around 1.000498</output>

<gadget id="calculator">(2_018_040/4_036_081) * (2_010/2_009)</gadget>
<output>4_056_260_400/8_108_486_729 = around 0.500249</output>

<result>4_056_260_400/8_108_486_729 = around 0.500249</result>