1.

If \[p={{x}^{\frac{1}{3}}}+{{x}^{\frac{1}{3}}}\] , then \[{{p}^{3}}-3p\] is equal to

A.  3 
B.      \[\frac{1}{2}(x+{{x}^{-1}})\]
C.  \[x+{{x}^{-1}}\]     
D.      \[2(x+{{x}^{-1}})\]
Answer» D.      \[2(x+{{x}^{-1}})\]


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