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Referring to the given circuit, find ZTH if R is 15 kΩ and RL is 38 kΩ.

89.82 ∠–51.3° kΩ
19.2 ∠–38.3° kΩ
9.38∠–51.3° kΩ
180 ∠–38.3° kΩ

Correct Answer: 9.38∠–51.3° kΩ

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