inverse function
Pronunciation
Noun
B2 Upper-intermediate
Quick answer
A function that reverses the effect of another function, so that applying one after the other returns the original input.
Usage notes
Graphically, a function and its inverse are mirror images of each other across the line y equals x.
Test yourself
Which word fits the gap? "The _____ of doubling a number is halving it."
Answer: inverse function
In your own words, what does "inverse function" mean?
A function that reverses the effect of another function, so that applying one after the other returns the original input.
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