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k a May Highlights and 2025 AoPS Online Class Information
jlacosta   0
May 1, 2025
May is an exciting month! National MATHCOUNTS is the second week of May in Washington D.C. and our Founder, Richard Rusczyk will be presenting a seminar, Preparing Strong Math Students for College and Careers, on May 11th.

Are you interested in working towards MATHCOUNTS and don’t know where to start? We have you covered! If you have taken Prealgebra, then you are ready for MATHCOUNTS/AMC 8 Basics. Already aiming for State or National MATHCOUNTS and harder AMC 8 problems? Then our MATHCOUNTS/AMC 8 Advanced course is for you.

Summer camps are starting next month at the Virtual Campus in math and language arts that are 2 - to 4 - weeks in duration. Spaces are still available - don’t miss your chance to have an enriching summer experience. There are middle and high school competition math camps as well as Math Beasts camps that review key topics coupled with fun explorations covering areas such as graph theory (Math Beasts Camp 6), cryptography (Math Beasts Camp 7-8), and topology (Math Beasts Camp 8-9)!

Be sure to mark your calendars for the following upcoming events:
[list][*]May 9th, 4:30pm PT/7:30pm ET, Casework 2: Overwhelming Evidence — A Text Adventure, a game where participants will work together to navigate the map, solve puzzles, and win! All are welcome.
[*]May 19th, 4:30pm PT/7:30pm ET, What's Next After Beast Academy?, designed for students finishing Beast Academy and ready for Prealgebra 1.
[*]May 20th, 4:00pm PT/7:00pm ET, Mathcamp 2025 Qualifying Quiz Part 1 Math Jam, Problems 1 to 4, join the Canada/USA Mathcamp staff for this exciting Math Jam, where they discuss solutions to Problems 1 to 4 of the 2025 Mathcamp Qualifying Quiz!
[*]May 21st, 4:00pm PT/7:00pm ET, Mathcamp 2025 Qualifying Quiz Part 2 Math Jam, Problems 5 and 6, Canada/USA Mathcamp staff will discuss solutions to Problems 5 and 6 of the 2025 Mathcamp Qualifying Quiz![/list]
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0 replies
jlacosta
May 1, 2025
0 replies
Incircle concurrency
niwobin   0
19 minutes ago
Triangle ABC with incenter I, incircle is tangent to BC, AC, and AB at D, E and F respectively.
DT is a diameter for the incircle, and AT meets the incircle again at point H.
Let DH and EF intersect at point J. Prove: AJ//BC.
0 replies
1 viewing
niwobin
19 minutes ago
0 replies
Weird locus problem
Sedro   1
N 28 minutes ago by sami1618
Points $A$ and $B$ are in the coordinate plane such that $AB=2$. Let $\mathcal{H}$ denote the locus of all points $P$ in the coordinate plane satisfying $PA\cdot PB=2$, and let $M$ be the midpoint of $AB$. Points $X$ and $Y$ are on $\mathcal{H}$ such that $\angle XMY = 45^\circ$ and $MX\cdot MY=\sqrt{2}$. The value of $MX^4 + MY^4$ can be expressed in the form $\tfrac{m}{n}$, where $m$ and $n$ are relatively prime positive integers. Find $m+n$.
1 reply
Sedro
Today at 3:12 AM
sami1618
28 minutes ago
Inequalities
sqing   4
N an hour ago by sqing
Let $ a,b,c\geq 0 , (a+8)(b+c)=9.$ Prove that
$$\frac{1}{a+1}+\frac{1}{b+1}+\frac{1}{c+1}\geq  \frac{38}{23}$$Let $ a,b,c\geq 0 , (a+2)(b+c)=3.$ Prove that
$$\frac{1}{a+1}+\frac{1}{b+1}+\frac{1}{c+1}\geq  \frac{2(2\sqrt{3}+1)}{5}$$
4 replies
sqing
Yesterday at 12:50 PM
sqing
an hour ago
Find the range of 'f'
agirlhasnoname   1
N 2 hours ago by Mathzeus1024
Consider the triangle with vertices (1,2), (-5,-1) and (3,-2). Let Δ denote the region enclosed by the above triangle. Consider the function f:Δ-->R defined by f(x,y)= |10x - 3y|. Then the range of f is in the interval:
A)[0,36]
B)[0,47]
C)[4,47]
D)36,47]
1 reply
agirlhasnoname
May 14, 2021
Mathzeus1024
2 hours ago
ISI UGB 2025 P1
SomeonecoolLovesMaths   4
N 2 hours ago by ZeroAlephZeta
Source: ISI UGB 2025 P1
Suppose $f \colon \mathbb{R} \longrightarrow \mathbb{R}$ is differentiable and $| f'(x)| < \frac{1}{2}$ for all $x \in \mathbb{R}$. Show that for some $x_0 \in \mathbb{R}$, $f \left( x_0 \right) = x_0$.
4 replies
1 viewing
SomeonecoolLovesMaths
5 hours ago
ZeroAlephZeta
2 hours ago
UC Berkeley Integration Bee 2025 Bracket Rounds
Silver08   11
N 3 hours ago by quasar_lord
Regular Round

Quarterfinals

Semifinals

3rd Place Match

Finals
11 replies
1 viewing
Silver08
May 9, 2025
quasar_lord
3 hours ago
nice integral
Martin.s   1
N 4 hours ago by ysharifi
$$ \int_{0}^{\infty} \ln(2t) \ln(\tanh t) \, dt $$
1 reply
Martin.s
Today at 10:33 AM
ysharifi
4 hours ago
D1028 : A strange result about linear algebra
Dattier   2
N 6 hours ago by ysharifi
Source: les dattes à Dattier
Let $p>3$ a prime number, with $H \subset M_p(\mathbb R), \dim(H)\geq 2$ and $H-\{0\} \subset GL_p(\mathbb R)$, $H$ vector space.

Is it true that $H-\{0\}$ is a group?
2 replies
Dattier
Yesterday at 1:49 PM
ysharifi
6 hours ago
Mathematical expectation 1
Tricky123   0
Today at 9:51 AM
X is continuous random variable having spectrum
$(-\infty,\infty) $ and the distribution function is $F(x)$ then
$E(X)=\int_{0}^{\infty}(1-F(x)-F(-x))dx$ and find the expression of $V(x)$

Ans:- $V(x)=\int_{0}^{\infty}(2x(1-F(x)+F(-x))dx-m^{2}$

How to solve help me
0 replies
Tricky123
Today at 9:51 AM
0 replies
Double integrals
fermion13pi   1
N Today at 8:11 AM by Svyatoslav
Source: Apostol, vol 2
Evaluate the double integral by converting to polar coordinates:

\[
\int_0^1 \int_{x^2}^x (x^2 + y^2)^{-1/2} \, dy \, dx
\]
Change the order of integration and then convert to polar coordinates.

1 reply
fermion13pi
Yesterday at 1:58 PM
Svyatoslav
Today at 8:11 AM
Roots of a polynomial not in the disc of unity
Fatoushima   1
N Today at 7:59 AM by alexheinis
Show that the polynomial $p_n(z)=\sum_{k=1}^nkz^{n-k}$ has no roots in the disc of unity.
1 reply
Fatoushima
Today at 1:48 AM
alexheinis
Today at 7:59 AM
Integration Bee Kaizo
Calcul8er   61
N Today at 6:36 AM by Svyatoslav
Hey integration fans. I decided to collate some of my favourite and most evil integrals I've written into one big integration bee problem set. I've been entering integration bees since 2017 and I've been really getting hands on with the writing side of things over the last couple of years. I hope you'll enjoy!
61 replies
Calcul8er
Mar 2, 2025
Svyatoslav
Today at 6:36 AM
Japanese Olympiad
parkjungmin   2
N Today at 5:26 AM by parkjungmin
It's about the Japanese Olympiad

I can't solve it no matter how much I think about it.

If there are people who are good at math

Please help me.
2 replies
parkjungmin
Yesterday at 6:51 PM
parkjungmin
Today at 5:26 AM
Japanese high school Olympiad.
parkjungmin   0
Today at 5:25 AM
It's about the Japanese high school Olympiad.

If there are any students who are good at math, try solving it.
0 replies
parkjungmin
Today at 5:25 AM
0 replies
find angle inside a right isosceles triangle (May Olympiad 2014 L1)
parmenides51   3
N Jun 4, 2024 by sunken rock
Let $ABC$ be a right triangle and isosceles, with $\angle C = 90^o$. Let $M$ be the midpoint of $AB$ and $N$ the midpoint of $AC$. Let $ P$ be such that $MNP$ is an equilateral triangle with $ P$ inside the quadrilateral $MBCN$. Calculate the measure of $\angle CAP$
3 replies
parmenides51
May 11, 2019
sunken rock
Jun 4, 2024
find angle inside a right isosceles triangle (May Olympiad 2014 L1)
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parmenides51
30652 posts
#1 • 2 Y
Y by Adventure10, Rounak_iitr
Let $ABC$ be a right triangle and isosceles, with $\angle C = 90^o$. Let $M$ be the midpoint of $AB$ and $N$ the midpoint of $AC$. Let $ P$ be such that $MNP$ is an equilateral triangle with $ P$ inside the quadrilateral $MBCN$. Calculate the measure of $\angle CAP$
This post has been edited 1 time. Last edited by parmenides51, Sep 27, 2021, 5:39 PM
Reason: latex
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vanstraelen
9022 posts
#2 • 2 Y
Y by Adventure10, Mango247
$A(-1,0),M(0,0),B(1,0),C(0,1),N(-\frac{1}{2},\frac{1}{2})$.

$P(\frac{\sqrt{3}-1}{4},\frac{\sqrt{3}+1}{4})$.

$\angle MAP =30^{\circ}$ and $\angle PAC=15^{\circ}$.
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parmenides51
30652 posts
#3
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This post has been edited 1 time. Last edited by parmenides51, Jun 3, 2024, 3:18 PM
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sunken rock
4394 posts
#4
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$N$ is circumcenter of $\triangle AMP\implies\widehat{MAP}=30^\circ$, i.e. $\widehat{CAP}=15^\circ$

Best regards,
sunken rock
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