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If y=sqrt(x+sqrt(x+sqrt(x.........oo))) ...

If `y=sqrt(x+sqrt(x+sqrt(x.........`oo`)))` then `dy/dx`

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`3x-7y^2+3xyz=3(2)-7(-4)^2+3(2)(-4)(1)`
`=6-7xx16-6xx4`
`=6-112-24`
`=6-136`
`=130`
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