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 Yearling
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  • 0 posts edited
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1d
asked How many solutions are $ a+b+c+d = 30 ,(a\leq b\leq c\leq d) $?
Feb
11
accepted $\lim_{x\to \infty}f(x)=\infty$ , $f(x)=x^n+a_{n-1}x^{n-1}+\cdots+a_1x+a_0$, $a_i\in \mathbb{R}(i=1,2,\cdots,n-1)$
Feb
11
comment $\lim_{x\to \infty}f(x)=\infty$ , $f(x)=x^n+a_{n-1}x^{n-1}+\cdots+a_1x+a_0$, $a_i\in \mathbb{R}(i=1,2,\cdots,n-1)$
Sorry! $a_{n-1}x^{n-1}$
Feb
11
comment $\lim_{x\to \infty}f(x)=\infty$ , $f(x)=x^n+a_{n-1}x^{n-1}+\cdots+a_1x+a_0$, $a_i\in \mathbb{R}(i=1,2,\cdots,n-1)$
Sorry! $a_{n-1}x^{n-1}$
Feb
11
revised $\lim_{x\to \infty}f(x)=\infty$ , $f(x)=x^n+a_{n-1}x^{n-1}+\cdots+a_1x+a_0$, $a_i\in \mathbb{R}(i=1,2,\cdots,n-1)$
added 4 characters in body
Feb
11
asked $\lim_{x\to \infty}f(x)=\infty$ , $f(x)=x^n+a_{n-1}x^{n-1}+\cdots+a_1x+a_0$, $a_i\in \mathbb{R}(i=1,2,\cdots,n-1)$
Feb
5
accepted Given the set $A=\{1,2,\dotsc,14\}$, find all subsets of $7$ elements that sum to a multiple of $7$.
Feb
5
asked Given the set $A=\{1,2,\dotsc,14\}$, find all subsets of $7$ elements that sum to a multiple of $7$.
Jan
24
accepted $a,b,x,y$: real number and satisfy $(x-a)^2+y^2=(y-b)^2+x^2=a^2+b^2$
Jan
23
awarded  Yearling
Jan
23
asked $a,b,x,y$: real number and satisfy $(x-a)^2+y^2=(y-b)^2+x^2=a^2+b^2$
Jan
7
accepted Prove that if $p$,$q$ and $\sqrt{2}p+\sqrt[3]{3}q$ are rational numbers then $p=q=0$
Jan
7
asked Prove that if $p$,$q$ and $\sqrt{2}p+\sqrt[3]{3}q$ are rational numbers then $p=q=0$
Jan
6
accepted show that $\sum_{k=1}^{n}\cos^2\left(\frac{2\pi k}{n}\right)=\frac{n}{2}$
Jan
5
revised show that $\sum_{k=1}^{n}\cos^2\left(\frac{2\pi k}{n}\right)=\frac{n}{2}$
added 11 characters in body
Jan
5
revised show that $\sum_{k=1}^{n}\cos^2\left(\frac{2\pi k}{n}\right)=\frac{n}{2}$
added 11 characters in body
Jan
5
asked show that $\sum_{k=1}^{n}\cos^2\left(\frac{2\pi k}{n}\right)=\frac{n}{2}$
Jan
5
accepted Find Maximum of $f(t) (0<t<2\pi)$? $f(t)=\sin(t)-\left(\cos(t)-1 \right)^2$
Jan
5
asked Find Maximum of $f(t) (0<t<2\pi)$? $f(t)=\sin(t)-\left(\cos(t)-1 \right)^2$
Jan
4
accepted Find Maximum of $f(t) (0<t<2)$? $f(t)=\frac{t^2-12 t+36}{6 \left(2 t^2-4 t+8\right)}$