Arjang

2,447 reputation

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	2,447 reputation	bio	website		visits	member for	2 years, 6 months
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12h	revised	Show that If k is odd, then $\Bbb{Q}_{4k}$ is isomorphic to $\Bbb{Z}_k \rtimes_{\alpha} \Bbb{Z}_4$ for some $\alpha$ edited title
13h	comment	$\int_0^1 \sqrt {\tan^{-1}x}\space dx=$? +1 for the nice formula, what is the page that talks about it?
22h	comment	Find the limit without use of L'Hôpital or Taylor series: $\lim \limits_{x\rightarrow 0} \left(\frac{1}{x^2}-\frac{1}{\sin^2 x}\right)$ @hmedan.mnsh : without Taylor sin x is meaningless in the context of taking limits without doing some pretty looking geometrical figures, the last limit is just as hard without using Taylor.
23h	comment	Find the limit without use of L'Hôpital or Taylor series: $\lim \limits_{x\rightarrow 0} \left(\frac{1}{x^2}-\frac{1}{\sin^2 x}\right)$ And the limit? How is that defined geometrically?
23h	comment	Find the limit without use of L'Hôpital or Taylor series: $\lim \limits_{x\rightarrow 0} \left(\frac{1}{x^2}-\frac{1}{\sin^2 x}\right)$ What is sin x without using Taylor?
23h	revised	Why is it important that a basis be orthonormal? added 321 characters in body
23h	comment	Find the limit without use of L'Hôpital or Taylor series: $\lim \limits_{x\rightarrow 0} \left(\frac{1}{x^2}-\frac{1}{\sin^2 x}\right)$ And what does the teacher mean by sin x? Without using Taylor series.
23h	comment	Find the limit without use of L'Hôpital or Taylor series: $\lim \limits_{x\rightarrow 0} \left(\frac{1}{x^2}-\frac{1}{\sin^2 x}\right)$ Why? What does sin mean without Taylor series? How is it defined?
23h	reviewed	Approve suggested edit on Find the limit without use of L'Hôpital or Taylor series: $\lim \limits_{x\rightarrow 0} \left(\frac{1}{x^2}-\frac{1}{\sin^2 x}\right)$
1d	revised	$\int^{441}_0\frac{\pi\sin \pi \sqrt x}{\sqrt x} dx$ edited title
1d	comment	$\int_0^1 \sqrt {\tan^{-1}x}\space dx=$? A little explanation please.
2d	comment	Is Multiplication A System? Maybe the term "Algebraic Structure" would be more suitable in this context, then numbers are the objects of the system and multiplication is one of the operations which will result in result that is already an object in the system ( another number real or complex).
2d	revised	Convergence of $\int_{-\infty}^\infty \frac{1}{1+x^6}dx$ added 3 characters in body
2d	revised	Convergence of $\int_{-\infty}^\infty \frac{1}{1+x^6}dx$ edited title
2d	revised	$ \sum_{y=1}^\infty {}_1F_1(1-y;2;-\pi\lambda c) \frac{\lambda^y}{y!} $ deleted 3 characters in body; edited title
2d	revised	Solve for $x$, $3\sqrt{x+13} = x+9$ edited title
May 21	comment	Infinitely many primes in every row of array? @lewist : please edit this question and add content of your comment on the top replacing "a friend of mine ...", also do the same with previous question.
May 21	comment	Why substitution method does not work for $\int (x-\frac{1}{2x} )^2\, \mathrm dx$? @Shakos : Thank you, that completely clarifies your answer, could you please include in the answer. +1
May 21	accepted	Why substitution method does not work for $\int (x-\frac{1}{2x} )^2\, \mathrm dx$?
May 20	comment	How to evaluate the integral $\int e^{x^3}dx $ +1 nice, how did you come by this?