Where Does the Induction Motor Torque Formula Come From?

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Cdz
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I am learning basic motor control and there is a formula list in my book.
Set of space-vector equations for an induction machine: u_s, u_r, lambda_s, lambda_r and T_e = (3/2) p Im(lambda_s* · i_s), with the slip term (omega_s − omega_m) and omega_se boxed in red.

The last one is for torque calculation, can anyone point out to me where this one is from or how is it derived?
 

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