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1994 AMC 12 Question 12

AMC12 · 1994 AMC 12

Question 12

If $i^2=-1,$ then $$
\left(i-i^{-1}\right)^{-1}=
$$
  1. $0$
  2. $-2i$
  3. $2i$
  4. $-\frac{i}{2}$
  5. $\frac{i}{2}$