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Response Details:
Given,
Efficcency,
Motor output,
We know,
Motor input
Therefore total losses,
These losses include
(i) Stator copper and core losses
(ii) Rotor copper losses
(iii) Rotor mechanical losses
Now no-load losses of an induction motor consists of
(i) Stator core losses, and
(ii) Mechanical losses,
i.e., 
Therefore
Let,
Stator core loss,
then Stator copper loss,
also Rotor copper loss,
Mechanical losses,
Therefore
Now, rotor input = motor ouput + mechanical losses + rotor copper losses
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