Question:`x - 1/x = a^2` হলে `x^2 + 1/x^2` এর মান কোনটি? 

A `a^2 + 2` 
B `a^2 - 2` 
C `a^4 - 2` 
D `a^4 + 2` 

+ Answer
D 

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Irin Moni

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