#2
Amp > microphone in front of it > PA. (Or multicore in-between).

If it's a bass guitar, a DI box is usually used in-between. (Sometimes a bass amp has a DI-out on it too)
#3
or take a cable from the output of the amp or even the headphone out if nessicary
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#4
If your amp has a direct out you can use it to great effect.
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