1.

Solve the expression \[\left( x-\frac{3}{x} \right)\left( x-\frac{3}{x} \right)=\]

A.  \[{{x}^{2}}+\frac{9}{{{x}^{2}}}-18\]      
B.  \[{{x}^{3}}+\frac{9}{{{x}^{3}}}-6\]
C.  \[{{x}^{2}}+\frac{9}{{{x}^{2}}}-6\]    
D.  \[{{x}^{2}}+\frac{1}{{{x}^{2}}}-6\]
Answer» D.  \[{{x}^{2}}+\frac{1}{{{x}^{2}}}-6\]


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