1.

What is the value of \[\frac{1}{1+{{a}^{(n-m)}}}+\frac{1}{1+{{a}^{(m-n)}}}?\]

A.  \[{{a}^{m-n}}\]               
B.         \[{{a}^{n-m}}\]               
C.  \[-1\]                   
D.         1
Answer» E.


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