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Question Number 98986 by Ar Brandon last updated on 17/Jun/20

$$\mathrm{Is}\mathrm{the}\mathrm{sequence}{\mathrm{u}}_{\mathrm{n}}=\cos \left(\frac{\mathrm{n}\pi }{20}\right)\mathrm{divergent}?$$

Answered by maths mind last updated on 17/Jun/20

$$u_{40n+10}=0$$$$u_{40n}=1$$$$\Rightarrow u_{n}hasnolimite$$

Commented by Ar Brandon last updated on 18/Jun/20

$$\mathrm{thanks}$$

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