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If a function f:R to R is defined as f(x...

If a function `f:R to R` is defined as `f(x)=x^(2)+1,` then find each of the following :
`(i) {x,f(x)=26}`
(ii) Pre-image of 17 under `f`
(iii) Pre-image of 2 under `f`

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