Question:`(a - 1/a)` এর বর্গ কোনটি? 

A `a^2 + 1/a^2 + 2` 
B `a^2 + 1/a^2 - 2` 
C `a^2 + 1/a^2 + 2a` 
D `a^2 - 1/a^2` 

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B 

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Irin Moni

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