What is the angular velocity defined by Slerp(q1(t), q2(t), s(t))?

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I wanna get the angular velocity of the rotation q(t) defined by Slerp(q1(t), q2(t), s(t)), where q stands for quaternion and Slerp is the spherical linear interpolation. Both q1 and q2 is time varying. So how could I get the derivative of the Slerp and the corresponding angular velocity?