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Problem 3. In the above system, we have G(s) 2 £93) where K 2 0. For each of
the following locations, determine if it is on the root locus of the system and explain why.
Further, if the answer is yes, find the corresponding value of K 2 0 that can place one of the closed—loop poles at that location. (a)s=0; (b)s=—4; (c)s=—4—j2; (d)s=—2+j2.

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