# Angles in degrees of pole locations of 4th order Butterworth low pass filter approximation from either...

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Angles in degrees of pole locations of 4th order Butterworth low pass filter approximation from either real axis are

A) +45,-45,+30,-30 B) +67.5,-67.5,+45,-45 C) +30,-30,+22.5,-22.5 D) +67.5,-67.5,+22.5,-22.5

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