Question:`a - 1/a = 2`হলে `a^2 + 1/a^2` = কত? 

A 6 
B 4 
C 8 
D 3 

+ Answer
A 

+ Explanation
`a^2 + 1/a^2`

  `= (a - 1/a)^2 + 2.a.1/a`

  `= 2^2 + 2 = 6`

+ Report

Irin Moni

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