Find input impedance and current from source of coupled circuit board

Hello dear students ,this playlist included all types of problems and concepts of 'Magnetically coupled circuit' i will attached links of other palylists which may be helpful for you.
Link for transient analysis
Link for Ac power and max power
Link for Magnetically coupled circuits
Link for Circuit theorem and laws
Link for Two port parameters

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[yashasvikumar]

In 3:40 How you convert that complex rectangular form into simple 28-j22
Please recommend me a video

[nesamlw]

where did you get the I2, please explain