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An operational-amplifier circuit is shown in the figure.

  1. $-(\frac{R_2}{R_1})v_i$
  2. $-(1+\frac{R_2}{R_1})v_i$
  3. $(1+\frac{R_2}{R_1})v_i$
  4. +$V_{sat}$ or -$V_{sat}$
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