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Prove that the curves x y=4 and x^2+y^2=...

Prove that the curves `x y=4` and `x^2+y^2=8` touch each other.

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Given :
`x y=4 ldots .(1) `
`x^{2}+y^{2}=8 ldots .(2)`
From `(1)`, we get
...
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