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[" 79.If "log(y)x+log(x)y=2,x^(2)+y=12" ...

[" 79.If "log_(y)x+log_(x)y=2,x^(2)+y=12" ,then the value of "xy" is "],[[" (a) "9," (b) "12," (c) "15," (d) "21]]

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