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Nice-calculus-evaluate-S-n-1-2-2n-1-cos-pi-2-n-M-N-1970-




Question Number 120875 by mnjuly1970 last updated on 03/Nov/20
          ... Nice calculus...            evaluate ::           S=  Σ_(n=1) ^∞ ((2^(−2n) /(1+cos((π/2^n )))))=??                    ...M.N.1970...
$$\:\:\:\:\:\:\:\:\:\:…\:\mathscr{N}{ice}\:{calculus}… \\ $$$$ \\ $$$$\:\:\:\:\:\:\:\:{evaluate}\::: \\ $$$$\:\:\:\:\:\:\:\:\:{S}=\:\:\underset{{n}=\mathrm{1}} {\overset{\infty} {\sum}}\left(\frac{\mathrm{2}^{−\mathrm{2}{n}} }{\mathrm{1}+{cos}\left(\frac{\pi}{\mathrm{2}^{{n}} }\right)}\right)=??\: \\ $$$$\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:…\mathscr{M}.\mathscr{N}.\mathrm{1970}… \\ $$

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