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if (log)y x+(log)x y=2,x^2+y=12 , the v...

if `(log)_y x+(log)_x y=2,x^2+y=12 ,` the value of `x y` is 9 (b) 12 (c) 15 (d) 30

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Let `log_y^x=t`
`t+1/t=2`
`t^2+1=2t`
`t^2-2t+1=0`
`(t-1)^2=0`
`t=1`
`log_y^x=1`
`x=y`
...
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