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Jul
21
comment How to evaluate $\sum_{n=1}^{38}\sin\left(\frac{n^8\pi}{38}\right)$
@AymanHourieh what do you mean by power reduction? you should notice that the power is inside not on the sin!
Jul
11
revised Find the differential of the function at the indicated number
added 16 characters in body
Jun
20
revised Find $\alpha,\beta,K$ $\frac{a_{n+1}+\alpha}{a_{n+1}+\beta}=K \left(\frac{a_{n}+\alpha}{a_{n}+\beta}\right) $
added 245 characters in body
Jun
9
revised If $G = HN$, $N\unlhd G$, $H\cap N = 1$ - is $G/N \cong H$?
added 6 characters in body
Jun
9
answered If $G = HN$, $N\unlhd G$, $H\cap N = 1$ - is $G/N \cong H$?
Jun
7
revised Show that $f(x) = x\sin(1/x)$ is Differentiable everywhere where $x\ne0$.
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May
26
revised Compute $\int_0^\infty \frac{dx}{1+x^3}$
added 7 characters in body
May
20
comment $f:\mathbb{R} \to \mathbb{R}$ st $f(\frac{1}{2^n})=0 \forall n \in \mathbb{N}$ , show $f'(0)=f''(0)=0$
@DonAntonio $f$ is defined from $(0,1)$ into $\mathbb{R}$.
May
20
comment $f:\mathbb{R} \to \mathbb{R}$ st $f(\frac{1}{2^n})=0 \forall n \in \mathbb{N}$ , show $f'(0)=f''(0)=0$
$f$ is not defined at $0$, therefore $f'(0)$ and $f''(0)$ do not exist.
May
14
answered Summation : Series with each term having components of two different series
May
13
reviewed Approve suggested edit on Show that $\sum{\frac{x^n}{(1+x^n)^n}}$ converges uniformly
May
12
reviewed Approve suggested edit on Relationship between column space and image (linear algebra)
May
9
revised Problem on solving Cauchy's Integral Formula
added 20 characters in body
May
7
comment Mix of contour integrals and mathematical induction?
You may check that $\int_{|z|=1}z^p\,dz=0$ for every integer $p \in \mathbb{Z}\setminus\{-1\}$.
May
7
answered Mechanics collision between two point masses
May
7
revised Mechanics collision between two point masses
deleted 5 characters in body
May
7
revised Mix of contour integrals and mathematical induction?
deleted 2 characters in body
May
7
revised Mix of contour integrals and mathematical induction?
added 2 characters in body
May
6
answered Mix of contour integrals and mathematical induction?
May
1
answered Evaluate $\displaystyle-\int e^{2x}\sin(e^{x})\ dx$