Yo Friends…As you know we love to give funny tricks here for you. So this is a funny mistake by PC calculator. Follow these steps to see the trick:Go to start then go to run
type calc in the box
It will open the calculator
Now type 4 and then click on root symbol
It will show the answer: 2
then click on subtract symbol(-) and type 2
As you know 2-2 is always 0 but it will show you the answer like this
Enjoy the life 
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