1.

If \[z(1+a)=b+ic\]and \[{{a}^{2}}+{{b}^{2}}+{{c}^{2}}=1\],then \[[(1+iz)/(1-iz)]=\]

A. \[\frac{a+ib}{1+c}\]    
B. \[\frac{b-ic}{1+a}\]
C. \[\frac{a+ic}{1+b}\]    
D. none of these
Answer» B. \[\frac{b-ic}{1+a}\]


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