IB SL Mathematics - Composite Functions, Domain & Range of Inverse Functions

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1) Pause the vid at the start
2) Try and do the Q
3) If ur stuck then keep watching!!
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Hey i watched your economics videos, im doing my IGCSE Edexcel exam in a few months but i have a problem, i dont understand the mark scheme and my teacher dosn't know how to explain it, could you please explain it?
Thanks!
I enjoy your vids!

Gregorio