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OpenStudy (anonymous):
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OpenStudy (anonymous):
If f^-1(x) = y, then f(y)=x.
OpenStudy (helder_edwin):
\[ \large f^{-1}(a)=b\Leftrightarrow a=f(b) \]
OpenStudy (anonymous):
got it now, thanks both of you!
OpenStudy (helder_edwin):
u r welcome
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