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2

Nov 10 '12

+2

19:08

accept

If $\displaystyle \sum_{n=0}^\infty c_n4^n$ is convergent, is $\displaystyle \sum_{n=0}^\infty c_n(-4)^n$ convergent as well?

2

Nov 9 '12

+2

06:22

accept

Need hint: Determine whether the series $\sum_{n=1}^{\infty}(\frac{n}{n+1})^{n^2}$ is convergent or divergent.

5

Oct 3 '12

+5

00:04

upvote

Need hint: Prove that $r = a (\sin t) + b (\cos t)$ is a circle, where $ab \neq 0$

17

Oct 2 '12

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