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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
Oct
30
accepted show that $a^3+4a=b^2$ then exist $M\in\mathbb{N}$ s.t $a=2M^2$
Oct
30
accepted Given a sequence $ (a_{n})_{n \in \mathbb{N}} $, find $ \sum_{n = 1}^{\infty} \frac{1}{a_{n} + 2} $.
Oct
30
accepted Prove that for every $x \in[0,1]$, there exists $c\in[0,1]$ such that $f(c)=1-f(x)$
Oct
30
accepted There exist $c(c\in \left(\frac{1}{2},1\right)$ s.t $2 \int _{0}^{1}f(x)dx=\frac{f(c)}{c} $
Oct
30
accepted How many solutions are $ a+b+c+d+e = 10 $
Oct
30
accepted How do I solve this exponential equation? $5^{x}-4^{x}=3^{x}-2^{x}$