Compute Rotation Angle at D  
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Diagram shows two shafts A B and C D of 35 millimeter diameter and 300 millimeter and 900 millimeter respectively, are connected using two gears, B with 100 millimeter diameter and C with 200 millimeter diameter. A torque T is applied at the end of C D at D. Parameters: d = 35 millimeter, G = 80 gega Pascal, T = 685 Newton meter.

Finally, calculate the rotation angle at D:

     WAIT A SECOND!
Aren't we missing something here?
What about those gears? Don't they need to be taken into account?