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If Z is the number of zeros of 1 + G(s) H(s) in the right half s plane. N is the number of clockwise encircle elements of (-1 + jo) point. P is the number of poles of G(s) H(s) in right half s plane. The Nyquist stability criterion can be expressed as
Options:
A .  Z = N + P
B .  Z = P/N
C .  Z = N - P
D .  Z = PN
Answer: Option A
Answer: (a).Z = N + P

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