Question:নিচের কোনটি অভেদ? 

A `a^2+b^2`=`(a+b)^2+2ab` 
B `a^2-b^2`=`(a-b)^2` 
C `(p+1)^2-(p-1)^2`=4p 
D `(a+1)^2+(a-a)^2`=4a 

+ Answer
C 

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Rashada Nipa

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