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Question Number 113975 by I want to learn more last updated on 16/Sep/20

$$\mathrm{Find}\mathrm{the}\mathrm{nth}\mathrm{term}:1,0,-1,0,1,0,-1,0,...$$

Answered by Olaf last updated on 16/Sep/20

$$u_n=\cos \left(n\frac{\pi }{2}\right)$$

Commented by I want to learn more last updated on 17/Sep/20

$$\mathrm{Please}\mathrm{workings}\mathrm{sir}$$

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