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yea
f%28x%29=y=x%5E2-12 f%5E%28-1%29: x=y%5E2-12 y%5E2=x%2B12 y=sqrt%28x%2B12%29 . For x=4: y=sqrt%284%2B12%29=sqrt%2816%29=4 . Since f%5E%28-1%29=4, (f+o f%5E%28-1%29)=f%284%29 . f%284%29=4%5E2-12=16-12=4
there u go
@Bobo-i-bo i got it
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