निम्नलिखित फलनों के परिसर बताएँ:
(i) `f(x) = x^(2) +2, x inR`,
(ii) `f(x) =2-3x, x inR` एवं `x gt 0`
(iii) `f(x) =1-x, x le 0, x+1, x gt 0`, (iv) `f(x) = x^(2)/(1+x^(2)), x inR`

Answer

(i) `[2, +infty]`, (ii) `(-infty, 2)`, (iii) `[1, + infty)`, (iv) `[0,1]`