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12 cards from this deck
Undoes what original function does
f−1(x)f^{-1}(x)f−1(x)
Function must be one-to-one
Each input → unique output and vice versa
To make function one-to-one
Write as y=f(x)y = f(x)y=f(x)
Interchange xxx and yyy
Make yyy the subject
Reflections across y=xy = xy=x
Becomes range of f−1(x)f^{-1}(x)f−1(x)
f(f−1(x))=xf(f^{-1}(x)) = xf(f−1(x))=x and f−1(f(x))=xf^{-1}(f(x)) = xf−1(f(x))=x
Inverse function, NOT rac{1}{f(x)}
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