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The circuit shown is a

  1. low pass filter with $\text{f}_{3\text{dB}}=\frac{1}{(R_1+R_2)C}\;\text{rad/s}$
  2. high pass filter with $\text{f}_{3\text{dB}}=\frac{1}{R_1C}\;\text{rad/s}$
  3. low pass filter with $\text{f}_{3\text{dB}}=\frac{1}{R_1C}\;\text{rad/s}$
  4. high pass filter with $\text{f}_{3\text{dB}}=\frac{1}{(R_1+R_2)C}{rad/s}$
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