Question:`x + 1/x = 2` হলে `x - 1/x` এর মান কত? 

A 0 
B 1 
C 2 
D 3 

+ Answer
A 

+ Explanation
`x - 1/x = sqrt((x + 1/x))^2 - 4.x.1/x`

           `= sqrt(2^2) - 4 = sqrt(4) - 4 = 0`

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Irin Moni

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