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visits member for 1 year, 7 months
seen Aug 17 at 13:06

Aug
3
asked prove that $\int_{0}^{1}|f(x)|dx \leq \int_{0}^{1}|f'(x)|dx$
Jul
21
asked There exist $c(c\in \left(\frac{1}{2},1\right)$ s.t $2 \int _{0}^{1}f(x)dx=\frac{f(c)}{c} $
Jul
11
asked How to integrate $\int \frac{x^2+\sin x}{2x+\cos x}dx=?$
Jul
2
awarded  Curious
Jul
2
awarded  Inquisitive
Jul
1
comment How to proof (using by mathematical induction)($n\in \mathbb{N}$)
Sorry $n=2,3,4,\cdots$
Jul
1
revised How to proof (using by mathematical induction)($n\in \mathbb{N}$)
deleted 1 character in body
Jul
1
asked How to proof (using by mathematical induction)($n\in \mathbb{N}$)
Jun
21
comment Given a sequence $ (a_{n})_{n \in \mathbb{N}} $, find $ \sum_{n = 1}^{\infty} \frac{1}{a_{n} + 2} $.
Thank you. And How to show that $\lim_{n\to\infty} a_n=\infty$
Jun
21
revised Given a sequence $ (a_{n})_{n \in \mathbb{N}} $, find $ \sum_{n = 1}^{\infty} \frac{1}{a_{n} + 2} $.
deleted 18 characters in body
Jun
21
asked Given a sequence $ (a_{n})_{n \in \mathbb{N}} $, find $ \sum_{n = 1}^{\infty} \frac{1}{a_{n} + 2} $.
Jun
3
asked How to integrate $\int |x-t|dx$
May
29
comment How many solutions are $ a+b+c+d+e = 10 $
It is possible to repeat
May
29
asked How many solutions are $ a+b+c+d+e = 10 $
May
2
asked Find a relation between $A$ and $B$?(2)
Apr
21
comment Find a relation between $a$ and $b$?
Thank you for your answer
Apr
20
comment Find a relation between $a$ and $b$?
$f(x)\neq x^2-2ax+b^2$, $f(x)=x^2-2ax+b$
Apr
20
asked Find a relation between $a$ and $b$?
Apr
5
comment If $a,b,c(a,b,c\in\mathbb{R} )$ satisfy $b^2-4ac<0$ then equation $f(x)=0$ has complex root
I mean that $f(x)=0$ must simply have a complex root
Apr
5
asked If $a,b,c(a,b,c\in\mathbb{R} )$ satisfy $b^2-4ac<0$ then equation $f(x)=0$ has complex root