The OLTF of the unity feedback control system is as given below:
\(G\left( s \right) = \dfrac{K}{{s\left( {s + 1} \right)\left( {s + 2} \right)}}\). If the value of ‘K’ is kept at the maximum value, so that the root locus of the system crosses the imaginary axis at a frequency of ‘a’ rad/sec then the value of a2 + 2 = _____
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