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Approximate (80)^(1//4) using differenti...

Approximate `(80)^(1//4)` using differentials

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Let `y=x^{1/4}`
and `x=81`
`x+trianglex=80`
`impliestrianglex=-1`
For `x=81,`
`y=(81)^{1/4}=3`
Let `dx=trianglex=-1`
As`y=x^{1/4}`,
...
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