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[" If "x=1+log(a)bc,y=1+log(b)ca,z=1+log...

[" If "x=1+log_(a)bc,y=1+log_(b)ca,z=1+log_(c)ab," then show that "xy+yz+zx=xyz],[" If "a^(x)=b^(y)=c^(z)" and "y^(2)=xz," then show that "log_(c)b=log_(b)a.]

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