Question:(x - 3y) এর বর্গ নিচের কোনটি? 

A `x^2 + 6xy + 9y^2` 

B `x^2 - 6xy + 9y^2` 

C `x^2 + 6xy - 9y^2` 

D `x^2 - 6xy - 9y^2` 

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