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The function $\"\"$ decreasing on the interval $\"\"$ .

If the function is one-to-one, then range of inverse function is domain of the function and domain of inverse function is range of the function.

If the function $\"\"$ decreasing on the interval $\"\"$ , then its inverse function $\"\"$ decreasing on the interval $\"\"$ .

Graph of $\"\"$ decreasing on the interval $\"\"$ .

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Graph of $\"\"$ decreasing on the interval $\"\"$ .