Question:নিম্নের কোন সূত্রটি সঠিক? 

A `a^2 - b^2 = (a + b)(a + b)` 

B `(a + b)^2 = (a - b)^2 2ab` 

C `(a + b)^2 = a^2 + 2ab + b^2` 

D `ab = ((a + b)/2)^2 + ((a - b)/2)^2 ` 

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