1.

Find the value of\[\frac{1}{1+{{x}^{a-b}}}+\frac{1}{1+{{x}^{b-a}}}\]

A.  0                                
B.  \[-\]1           
C.  1   
D.  \[{{x}^{a+b}}\]
Answer» D.  \[{{x}^{a+b}}\]


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