Question:`x + 1/x = sqrt 2` হলে,  `x^2 + 1/x^2` এর মান কত? 

A -2 
B 0 
C 4 
D 6 

+ Answer
B 

+ Explanation
`x^2 + 1/x^2 = ( x + 1/x)^2 - 2.x 1/x = (sqrt 2)^2 - 2 = 2 - 2 = 0`

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Zinia Islam

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