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43. For the circuit shown, determine ZTH for the portion of the circuit external to RL.
(a) 66.7 ∠–33.7° kΩ
(b) 6.67 ∠–333.7° kΩ
(c) 14.4 ∠–56.3° kΩ
(d) 1.44 ∠–33.7° kΩ
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