@KnowledgeS Once you get through that process and, perhaps, try out a few different ideas of your own on it, too, then you may be ready to take on some problems with respect to mismatched BJTs. The two initial mismatches will be Vbe and Beta. But another will be that the two BJTs are NOT at the same temperature during operation. All these mismatches become more obvious with more gain, too. The circuit you have makes some attempts to deal with this for a student lab built and operated by newbies. But the reasoning would more than double what I wrote above.
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