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An inverse function reverses what another function does: if a function turns an input into an output, its inverse function turns that output back into the original input. Inverse functions are useful because they let you undo a mathematical operation and recover the starting value from the result.
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Article · 中文
在數學裡，反函數，也称为逆函数（英語：Inverse function），為對一個定函數做逆運算的函數。
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