Question:`a^2 + b^2` = কত? 

A `((a + b)^2 + (a - b))^2/2` 
B `((a + b)/2)^2 - ((a - b)/2)^2` 
C `((a + b)^2 - (a - b))/2` 
D `((a + b)/2)^2 - ((a - b)/2)` 

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A 

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Irin Moni

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