Friday, 30 July 2021

Find the number of \(f:\{1,\ldots, 5\}\to \{1,\ldots, 5\}\) such that \(f(f(x))=x.\)
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Define \(f: \mathbb{R} \rightarrow \mathbb{R}\) by \[f(x)= \begin{cases}(1-\cos x) \sin \left(\frac{1}{x}\right), & x \neq 0 \\ 0, ...