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Consider the system shown. Determine the trasfer function of the closed$-$loop system and answer

a$)$ Determine the closed$-$loop transfer function.

b$)$ Find the range of $K$ that makes the closed$-$loop system stable.

Note: If there is no value of $K$ that makes the closed$-$loop system stable, then mentioned that the closed$-$loop system is always unstable.

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