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OpenStudy (unklerhaukus):
\[\sin\big(\frac{n\pi}2\big), \qquad \qquad n\in \mathbb N\]
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OpenStudy (unklerhaukus):
\[=\{1,0,-1,0,1,0,-1,....\}\]
OpenStudy (unklerhaukus):
how else can i write this
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