1.

The product of \[1\times (x-y)\,\,(x+y)\,({{x}^{2}}+{{y}^{2}})\] is

A. \[{{x}^{2}}-{{y}^{2}}\]     
B.  \[{{x}^{4}}+{{y}^{4}}\]
C. \[{{x}^{4}}-{{y}^{4}}\]     
D.  \[{{x}^{2}}+{{y}^{2}}\]
Answer» D.  \[{{x}^{2}}+{{y}^{2}}\]


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