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Question Number 78447 by arkanmath7@gmail.com last updated on 17/Jan/20

$$provethattheseq{a}_n=\frac{ncos(3n^2+2n+1)}{n+1}$$$$hasconvergentsubsequence$$

Answered by mind is power last updated on 17/Jan/20

$$\mid {\mathrm{a}}_{\mathrm{n}}\mid <1\Rightarrow \mathrm{by}\mathrm{Weirstrass}{\mathrm{a}}_{\mathrm{n}}\mathrm{has}\mathrm{a}[\mathrm{convergent}\mathrm{Subsquence}$$

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