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visits member for 2 years
seen Jan 15 at 12:40

Jan
23
awarded  Yearling
Jan
14
accepted Can be solved without L'Hopital? $\lim_{x\to 1} \frac{x-1-\ln x}{x\ln x+1-x}=?$
Jan
14
asked Can be solved without L'Hopital? $\lim_{x\to 1} \frac{x-1-\ln x}{x\ln x+1-x}=?$
Jan
5
accepted Find $\lim_{n\to \infty}f_{n}(1)=?$
Jan
5
comment Find $\lim_{n\to \infty}f_{n}(1)=?$
$f_{1}(x)=\frac{1}{2}-\frac{1}{2(x+1)^2}$, $f_{2}(x)=\frac{1}{2} \left(x+\frac{1}{x+1}\right )-\frac{1}{2}$, $f_{3}(x)=\frac{1}{4} \left((x-1)^2+2 \ln (2 (x+1))\right)+\frac{1}{4} (-1-2 \ln (2))$
Jan
5
asked Find $\lim_{n\to \infty}f_{n}(1)=?$
Dec
8
accepted $A,B,C$ satisfy $\sin 2A: \sin 2B: \sin 2C= 5:12:13$ find $A$?
Dec
8
asked $A,B,C$ satisfy $\sin 2A: \sin 2B: \sin 2C= 5:12:13$ find $A$?
Nov
29
comment For a matrix ($2 \times 2$) $A$ satisfing (1.), (2.), (3.), show that $-2\leq a+d\leq 2$
Thank you very much!!!
Nov
29
accepted For a matrix ($2 \times 2$) $A$ satisfing (1.), (2.), (3.), show that $-2\leq a+d\leq 2$
Nov
29
revised For a matrix ($2 \times 2$) $A$ satisfing (1.), (2.), (3.), show that $-2\leq a+d\leq 2$
edited body; edited title
Nov
29
asked For a matrix ($2 \times 2$) $A$ satisfing (1.), (2.), (3.), show that $-2\leq a+d\leq 2$
Nov
1
asked How to find the remainder of $\dfrac{a_{2011}}{5}$?
Oct
30
accepted Find maximum of a function 4
Oct
30
accepted Series $f(p)$ is a multiple of $p$
Oct
30
accepted sum and product of two rational numbers are both integers
Oct
30
accepted Can we find positive integers $a$ and $k \geq 2$ with $2^n - 1 = a^k$?
Oct
30
accepted $f:R\to R$ and conti-function and for all $x \in R$, $f$ satisfy
Oct
30
accepted Trigonometric Integral : $\int\frac{1}{\sin x+ 3\cos x}dx$
Oct
30
accepted Finding the summation of the floor of the series identity