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Kenneth Rosen Edition 7 Exercise 2.3 Question 23 (Page No. 153)

in Set Theory & Algebra
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Determine whether each of these functions is a bijection from$R$ to $R.$

  1. $f(x) = 2x+1$
  2. $f(x) = x^2+1$
  3. $f(x) = x^3$
  4. $f(x) = (x^2+1)/(x^2+2)$
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