A) \[\left( 1\text{ }+\text{ }x\text{ }-\text{ }y \right)\left( 1\text{ }\text{ }x\text{ }+\text{ }y \right)~\]
B) \[\left( 1\text{ }+\text{ }x\text{ }+\text{ }y \right)\left( 1\text{ }\text{ }x\text{ }-\text{ }y \right)\]
C) \[\left( 1\text{ }+\text{ }xy \right)\left( x\text{ }+\text{ }y\text{ }+\text{ }l \right)~\]
D) \[\left( 1\text{ }-\text{ }xy \right)\left( 1+\text{ }x\text{ }+\text{ }y \right)\]
E) None of these
Correct Answer: B
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