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Mar
11
answered Evaluating $\int_0^{\pi/2} \frac{a}{a^2+\cos^2 \theta} \, d\theta$
Mar
11
comment how to show $\frac{1+\cos x+\sin x}{1+\cos x-\sin x} = \frac{1+\sin x}{\cos x}$
t = -2 is completely justified, essentially you go back in time by 2 units and then throw the ball. It is just time travel 101 :P ;-)
Mar
11
comment how to show $\frac{1+\cos x+\sin x}{1+\cos x-\sin x} = \frac{1+\sin x}{\cos x}$
If only indeed! I tried to put something on top, but nothing I tried made much sense :D
Mar
11
comment how to show $\frac{1+\cos x+\sin x}{1+\cos x-\sin x} = \frac{1+\sin x}{\cos x}$
I left it as such because of the diamond actually :-)
Mar
11
answered how to show $\frac{1+\cos x+\sin x}{1+\cos x-\sin x} = \frac{1+\sin x}{\cos x}$
Mar
11
revised if $p \mid (a^2 + b^2 )$, $p \nmid a$ and $p \nmid b$. Prove that there exists an integer $c$ such that $c^2 \equiv −1 \mod p$.
Latex Corrections
Mar
11
suggested approved edit on if $p \mid (a^2 + b^2 )$, $p \nmid a$ and $p \nmid b$. Prove that there exists an integer $c$ such that $c^2 \equiv −1 \mod p$.
Mar
11
comment Prove $(1 +\frac{ 1}{n}) ^ {n} \ge 2$
Nope. This is a direct proof using binomial expansion.
Mar
11
answered Prove $(1 +\frac{ 1}{n}) ^ {n} \ge 2$
Mar
6
comment Show that if $n$ is composite, then $\phi(n) \leq n-\sqrt{n}$
math.stackexchange.com/questions/896920/…
Mar
4
revised Find all solutions to $x^{10} = 1 \pmod {377}$
minor corrections
Mar
4
suggested approved edit on Find all solutions to $x^{10} = 1 \pmod {377}$
Mar
2
revised Prove that there is an increasing sequence $\{a_n\}$ of points in $A$ such that $\lim a_n = \sup A$.
minor correction
Mar
2
suggested approved edit on Prove that there is an increasing sequence $\{a_n\}$ of points in $A$ such that $\lim a_n = \sup A$.
Feb
14
suggested rejected edit on Schwarz Inequality?
Feb
14
answered Divide By Vector
Feb
13
answered Evaluating $\lim_{n\to\infty}\small\left(\frac{1}{\sqrt{n}\sqrt{n+1}}+\frac{1}{\sqrt{n}\sqrt{n+2}}+\cdots+\frac{1}{\sqrt{n}\sqrt{n+n}}\right)$
Jan
29
revised Find $\lim_{x\to \infty}{[({1\over e}(1+{1\over x})^x)]^x}$.
corrected the latex
Jan
29
suggested approved edit on Find $\lim_{x\to \infty}{[({1\over e}(1+{1\over x})^x)]^x}$.
Jan
21
comment show that $ 4 = \sum_{n=1}^\infty (-2)^{n+1}\frac{n+2}{n!} $
@learnmore 2*(-1)^n is not (-2)^n