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  • Civil Engg. (GATE) 2009
  • The analytic function f(z) = $\frac{z - 1}{z^2 + 1}$ has ...
Multiple choice

The analytic function f(z) = $\frac{z - 1}{z^2 + 1}$ has singularities at

  1. 1 and - 1

  2. 1 and i

  3. 1 and - i

  4. i and - i

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Singularities of a rational function occur where the denominator is zero. Setting z^2 + 1 = 0 leads to z^2 = -1, which gives z = i and z = -i.

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