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Question Number 97506 by ali_golmakani last updated on 08/Jun/20

please prove it    cos x= J_0 (x) + 2Σ_(x−1) (−1)^x J_(2n) (x)

$${please}\:{prove}\:{it} \\ $$$$ \\ $$$$\mathrm{cos}\:{x}=\:{J}_{\mathrm{0}} \left({x}\right)\:+\:\mathrm{2}\sum_{{x}−\mathrm{1}} \left(−\mathrm{1}\right)^{{x}} {J}_{\mathrm{2}{n}} \left({x}\right) \\ $$

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