Question
Write out the first five terms of the sequence, determine whether the sequence converges, and if so find its limit.$$\left\{\cos \frac{\pi n}{2}\right\}_{n=1}^{+\infty}$$
Step 1
The general term of the sequence is given by $\cos \frac{\pi n}{2}$, where $n$ is a positive integer. Show more…
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