1.

Simplify\[\frac{{{a}^{\frac{1}{2}}}+{{a}^{-\frac{1}{2}}}}{1-a}+\frac{1-{{a}^{-\frac{1}{2}}}}{1+\sqrt{a}}\].

A.  \[1\]                
B.         \[0\]    
C.  \[\frac{2}{1-a}\]           
D.         \[1+a\]
Answer» D.         \[1+a\]


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