A) \[2ab\]
B) \[{{a}^{2}}+{{b}^{2}}\]
C) \[2{{a}^{2}}+2{{b}^{2}}\]
D) \[4ab\]
Correct Answer: D
Solution :
(d): \[{{(a+b)}^{2}}-{{(a-b)}^{2}}=(a+\cancel{b}+a-\cancel{b})(\cancel{a}+b-\cancel{a}+b)\] \[=2a\times 2b=4ab.\]
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