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Your question is fully explained in Sedra-smith. but basically, first detect the type of feedback which is voltage-voltage (parallel-series) in this case. Deactivate the feedback which means cut its input and output, (Do not ground it) apply a voltage source in the output end and then find the input. this is the beta you are looking for.
Check Sedra, and if you still have unsolved problems, just shout.
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