I know that cos(n*pi) will diverge, but how about [cos(n*pi)] / [sqrt(n)] ? thanks
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Hint: $\displaystyle \cos \pi n = (-1)^n$.
diverge b/c geometric: |-1| = 1 so diverge correct logic?
Originally Posted by DINOCALC09 diverge b/c geometric: |-1| = 1 so diverge correct logic? It converges by alternating series test.
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