Use the definition of a logarithm to prove 
.Hint: Let 
and 
.Then, 
and 
.
A) Let 
and
so that
and
.Then
and by definition,
; that is
.
B) Let 
and
so that
and
.Then
and by definition,
; that is
.
C) Let 
and
so that
and
.Then
and by definition,
; that is
.
Correct Answer:
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