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1h
comment Arithmetic and Geometric Mean Inequalities
artofproblemsolving.com/Wiki/index.php/Proofs_of_AM-GM
1h
comment prime division problem
@user2008730, $$1,2,5???$$
2h
comment prime division problem
@user2008730, Prove what?
2h
comment Adjacent non-coprime numbers
$$(n,n+1)=(n,1)=\cdots$$
2h
comment Finding the points where a circle intersects an axis
in.answers.yahoo.com/question/index?qid=20090115155833AAmSAr2
2h
comment How prove this triangulation with indentity
@chinamath, Have you verified my last statement?
2h
revised How prove this triangulation with indentity
added 1 character in body
2h
comment Trigonometric equation for double angle
Sorry, probably problem with page loading
2h
answered How prove this triangulation with indentity
3h
comment How to simplify $(x+4)^2$?
What are the different answers? Btw, rectify the 'tag'
3h
comment prime division problem
More briefly, $$(abc)(abc)=abc(1000+1)$$
3h
revised How solve this equation $\sin x\cdot \sin20=2\sin(110-x) (\sin10)^2$
deleted 335 characters in body
3h
answered How solve this equation $\sin x\cdot \sin20=2\sin(110-x) (\sin10)^2$
7h
answered how shall i find the $n$-th term of this,
10h
answered Another exercise in number theory
11h
comment $(a, b) = (b, c) = (a, c) = 1$ implies $(c^2, ab) = (ab, a^n - b^n) = (c^2, a^n - b^n) = 1$?
Wish I know the mistake here
13h
awarded  Nice Answer
14h
answered How to solve $\int \frac{\tan^{-1}x}{(1+x)^2}dx$?
15h
answered $(a, b) = (b, c) = (a, c) = 1$ implies $(c^2, ab) = (ab, a^n - b^n) = (c^2, a^n - b^n) = 1$?
1d
comment Can the inequality $a^3 + b^3 + c^3 \ge a^2b + ac^3 + b^2c$ be derived from arithmetic-geometric means?
math.stackexchange.com/questions/900973/…