Mathematics
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Khosrotash
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Ph.D. in numerical analysis. Also a n educator of mathematics. If you want to pop an email 2 me :khosrotash@mathgifs.ir

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All Questions Answers
Score Newest
answer
55
Sum of series $\sum \limits_{k=1}^{\infty}\frac{\sin^3 3^k}{3^k}$
Jan 23, 2017
question
40
Find the height of a bar, given the lengths of shadows cast by it and another bar
Oct 13, 2017
answer
30
Other Idea to show an inequality $\dfrac{1}{\sqrt 1}+\dfrac{1}{\sqrt 2}+\dfrac{1}{\sqrt 3}+\cdots+\dfrac{1}{\sqrt n}\geq \sqrt n$
Feb 18, 2017
question
27
New Idea to prove $1+2x+3x^2+\cdots=(1-x)^{-2}$
Jul 24, 2015
answer
26
Congruence Arithmetic Laws, e.g. in divisibility by $7$ test
Jul 18, 2015
answer
26
Why does the series $\sum_{n=1}^\infty\frac1n$ not converge?
Nov 1, 2013
answer
23
Find the value of $\sum_{m=1}^\infty \tan ^ {-1}\frac{2m}{m^4+m^2+2}$
Apr 14, 2015
answer
21
How to find length of a part of a curve?
Feb 3, 2017
question
20
Is there a geometric method to show $\sin x \sim x- \frac{x^3}{6}$
Aug 10, 2017
answer
19
Proving $1^3+ 2^3 + \cdots + n^3 = \left(\frac{n(n+1)}{2}\right)^2$ using induction
Feb 10, 2017
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Developing a stochastic differential equation model for concrete fibers

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