I want to know why they use Zth* instead of the original Zth* to get the impedance of the inductor.

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Consider the AC steady-state AC steady-state circuit shown below. (a) Find thevenin equivalent circuit between the teminal a—b using open circuit voltage VOC and shortcircuit current I 50 (b) If load impedance Z L is connected between the terminals a—b, ?nd the value of this impedance thatwill maximum average power absorb maximum average power and ?nd the value of this power. (0) Repeat parts (b) if a pure resistance BL is connected between the terminals a-b, instead of theimpedance Z L. 200 Q a