Determine the amplitude of forced torsional vibration of a shaft produced by a periodic torque T.sint if

Determine the amplitude of forced torsional vibration of a shaft produced by a periodic torque T.sinωt if the free torsional vibration has the frequency of 10 cycles per second, the forcing frequency is 10π rad/s, and the angle of twist produced by the torque T (acting statically) is equal to 0.01 rad.