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Please help to find an expression for Beta cutoff frequency f(beta), which is simply a high frequency current-gain cutoff point of the transistor with collector and emitter terminals shorted as shown in the circuit attached.
Have you tried to write the expression for the voltage appearing at the B' node with respect to an applied signal at B? It's just a simple voltage divider. Since the output is shorted, there is no further frequency dependence past B'.
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