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Hvilke av funksjoner av $x$ under er injektive (har en invers)? 

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    $y$ er skostørrelse                   
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$y$ er hans/hennes bursdagen", "$x-7y=58$", "$y=x^2-4$", "", "", "\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
$x$-7-207
$y$-22-22815
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$x$-2078
$y$30-1411
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$x$-7-207
$y$15151515
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