Let f={(3,\ 1),\ (9,\ 3),\ (12 ,\ 4)} an...

Let `f={(3,\ 1),\ (9,\ 3),\ (12 ,\ 4)}` and `={(1,\ 3),\ (3,\ 3),\ (4,\ 9),\ ` `(5,\ 9)}` . Show that `gof` and `fog` are both defined. Also, find `fog` and `gofdot`

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