1.

If x=1 +log_(e) bc, ..........

Answer»


SOLUTION :`x=log_(a) a+log_(a) bc=log_(a) abc`
Similarly `y=log_(B) abc`
`z=log_(c) abc`
`(XYZ)/(xy+yz+zx)=1/(1/x+1/y+1/z)=1/(log_(abc) abc)=1`


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