(1-(1/(2**2)))*(1-(1/(3**2)))*(1-(1/(4**2)))*...*(1- (1/(10**2))).
(1-(1/(2**2)))*(1-(1/(3**2)))*(1-(1/(4**2)))*…*(1-(1/(10**2)))．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">11 / 10</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">(1/2) * (11/10)</gadget>
<output>11/20 = around 0.55</output>

<result>11/20 = around 0.55</result>