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If agt0,cgt0,b=sqrt(ac),a,c and ac ne 1 ...

If `agt0,cgt0,b=sqrt(ac),a,c` and `ac ne 1 , N gt0` prove that `(log_(a)N)/(log_(c )N)=(log_(a)N-log_(b)N)/(log_(b)N-log_(c )N)`

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