Mathematics
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sirous
  • Member for 6 years, 9 months
  • Last seen this week
  • Tehran, Tehran Province, Iran
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About

I am a retired engineer. Highly curious and enthusiast in experimental mathematics.

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View all questions and answers
All Questions Answers
Score Newest
question
10
Sum of series : $1+11+111+...$
Sep 29, 2016
answer
8
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
answer
7
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
answer
7
Is there a square with all corner points on the spiral $r=k\theta$, $0 \leq \theta \leq \infty$?
Jul 20, 2021
answer
7
How do you solve a system of quadratic equations?
Feb 17, 2017
answer
6
Prove that $BD$ bisects $\angle ABC$
Apr 20, 2019
answer
6
Sum to n terms the series $\cos \theta+ 2\cos 2\theta+ \cdots + n\cos n\theta$
Aug 27, 2018
answer
5
An algebraic solution for $\log_3(x+1)+\log_2(x)=5$
Aug 16, 2019
answer
5
Will a circle projected onto a cylinder be an ellipse?
Jan 16, 2022
answer
5
Divisibility 1,2,3,4,5,6,7,8,9,&10
Oct 27, 2018

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