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Mathematics
MoNtiDeaD MoonDogs's user avatar
MoNtiDeaD MoonDogs's user avatar
MoNtiDeaD MoonDogs's user avatar
MoNtiDeaD MoonDogs
  • Member for 7 years, 6 months
  • Last seen more than 5 years ago
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17
Convergence or divergence of $\sum_{n=1}^{\infty}\frac{1}{n^{2-\cos n}}$
Jan 29, 2018
6
Help for series calculation $\sum_{n\ge1} \frac{1}{4n^3-n}$
Jan 20, 2017
6
How can I find $\sum_{cyc}\sin x\sin y$
Jan 26, 2017
5
Evaluate $\lim_{n\rightarrow\infty} \frac{a_n}{b_n}$
Feb 12, 2017
5
A trigonometric sum (is it a Ramanujan sum?)
Jul 9, 2017
4
Difficult trigonometry problem to find the minimum value
Jan 31, 2017
3
Find explicit term of $a_n$ without using induction.
Feb 13, 2017
3
Find the minimum value of $f=x^2+y^2+x(1-y)+y(1-x)$, holds on $x,y$ are integers.
Mar 5, 2017
3
find all $k$ that $k^{18}+k^9+1$ is prime.
Mar 28, 2017
3
$\sum_{j=i}^n\binom nj\binom jix^{n-j}=\binom ni\left(\frac1x+1\right)^{n-i}x^{n-i}$
May 25, 2017