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Mathematics
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sirous
  • Member for 8 years, 4 months
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  • Tehran iran
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I am a retired engineer interested in mathematics especially in number theory and geometry.Mathematics is best to activate your brain and satisfy your curiosity.

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11
Sum of series : $1+11+111+...$
Sep 29, 2016
8
How do you solve a system of quadratic equations?
Feb 17, 2017
7
Prove $\sum_{n=1}^{\infty} \arctan\left(\frac{1}{F_n}\right) \arctan\left(\frac{1}{F_{n+1}}\right)=\frac{\pi^2}{8}$
Apr 4, 2021
7
Is there a square with all corner points on the spiral $r=k\theta$, $0 \leq \theta \leq \infty$?
Jul 20, 2021
6
Sum to n terms the series $\cos \theta+ 2\cos 2\theta+ \cdots + n\cos n\theta$
Aug 27, 2018
6
How to evaluate $\int_{\pi/2}^\pi \sqrt{1 - \frac{1}{2}\cos^2 x + \sin x \sin 2x} \;\mathrm{d}x$
Oct 9, 2018
6
Does equation $a^m+b^n =c^{m+n}$ have integral solutions?
Jul 27, 2023
6
Prove that $BD$ bisects $\angle ABC$
Apr 20, 2019
5
An algebraic solution for $\log_3(x+1)+\log_2(x)=5$
Aug 16, 2019
5
Divisibility 1,2,3,4,5,6,7,8,9,&10
Oct 27, 2018