Question:যদি `a>0`  এর জন্য  `a^2 - 3a +1 = 0` হয় তবে  `a^2 - 1/a^2` এর মান কত? 

A `15` 
B `3 sqrt 5` 
C `+-sqrt 5` 
D `- 3 sqrt 5` 

+ Answer
B 

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Zinia Islam

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