1.

If \[x+\frac{1}{x}=a+b\] and \[x-\frac{1}{x}=a-b\], which of the following is true?

A. \[ab=1\]           
B.        \[a=b\] 
C.        \[ab=2\]           
D.        \[a+b=0\]
Answer» B.        \[a=b\] 


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