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Let x ,y ,z in R such that xy+z=6a n xx...

Let `x ,y ,z in R` such that `x_y+z=6a n xx y+y z+z x=7.` Then find the range of values of `x ,y ,a n dzdot`

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The correct Answer is:
`[(6-2sqrt(15))/(3),(6+2sqrt(15))/(3)]`
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