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Sagot :
[tex]f(x)=2x+2\\
y=2x+2\\
2x=y-2\\
x=\frac{1}{2}y-1\\
f^{-1}(x)=\frac{1}{2}x-1\\
f^{-1}(4)=\frac{1}{2}\cdot4-1\\
f^{-1}(4)=2-1\\
f^{-1}(4)=1
[/tex]
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