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Question Number 30549 by abdo imad last updated on 23/Feb/18
let S(x)= Σ_(n=0) ^∞ (x^(3n) /((3n)!)) find S(x).
$${let}\:{S}\left({x}\right)=\:\sum_{{n}=\mathrm{0}} ^{\infty} \:\:\frac{{x}^{\mathrm{3}{n}} }{\left(\mathrm{3}{n}\right)!}\:\:{find}\:{S}\left({x}\right). \\ $$

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