A) \[{{a}^{2}}-{{b}^{2}}\]
B) \[{{b}^{2}}+{{c}^{2}}\]
C) \[{{c}^{2}}+{{d}^{2}}\]c
D) None
Correct Answer: A
Solution :
\[{{a}^{2}}+{{b}^{2}}+2ab-{{a}^{2}}+2ab+{{b}^{2}}+{{a}^{2}}-{{b}^{2}}-4ab\] \[={{a}^{2}}-{{b}^{2}}\]
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