Friday, 20 August 2021

The expression \[\sum_{k=0}^{10} 2^{k} \tan \left(2^{k}\right)\] equals

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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, ...