Hello everyone, I'm currently learning about BJT. I found a PDF online with the general circuit of a class A amplifier:
they further simplify it in this circuit below, but they don't explain how:

The problem I'm having is that I'm trying to simplify it by myself, but I'm struggling with it.
Here are the formulas I should get
The PDF explained Thevenin and Norton equivalent were used but no method is showed. I know how to apply the equivalent and theorems in simpler network bu this one is too complex for me!
Do you have any idea to get the simplified circuit?
Thanks in advance
they further simplify it in this circuit below, but they don't explain how:

The problem I'm having is that I'm trying to simplify it by myself, but I'm struggling with it.
Here are the formulas I should get
The PDF explained Thevenin and Norton equivalent were used but no method is showed. I know how to apply the equivalent and theorems in simpler network bu this one is too complex for me!
Do you have any idea to get the simplified circuit?
Thanks in advance