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Mathematics
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benji
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24
The set $\{1,2,3,\ldots,n\}$, where $n \geq 5$, can be divided into two subsets so that the sum of the first is equal to the product of the second
Feb 8, 2015
answer
12
How to show that $f\equiv 0$?
Feb 8, 2015
answer
8
Establish the identity $\frac{\cot\theta + \sec\theta}{\cos\theta + \tan\theta} = \sec\theta \cot\theta\$
Mar 5, 2016
answer
8
Very confused $x^2$ has 1 root
Feb 9, 2015
answer
7
Identity function that returns $1$ for the input $0$.
Dec 18, 2016
answer
6
Proving arg(z/w)=arg(z)-arg(w)
Jan 23, 2015
answer
5
Epsilon delta proof in Complex variables
Jan 14, 2015
question
4
Convergence of $\sum \frac{(-1)^{n+1}}{n}z^n$ at $|z|=1$
Mar 4, 2015
answer
4
Prove that if $a,b\geq0$ and $a^2<b^2$ then $a<b$
Dec 30, 2014
answer
4
Such that $x+y=1$, how can I show that for any positive real numbers $x,y$ we have $(1+\frac{1}{x})(1+\frac{1}{y})\geq 9$?
Mar 13, 2015