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k a April Highlights and 2025 AoPS Online Class Information
jlacosta   0
Apr 2, 2025
Spring is in full swing and summer is right around the corner, what are your plans? At AoPS Online our schedule has new classes starting now through July, so be sure to keep your skills sharp and be prepared for the Fall school year! Check out the schedule of upcoming classes below.

WOOT early bird pricing is in effect, don’t miss out! If you took MathWOOT Level 2 last year, no worries, it is all new problems this year! Our Worldwide Online Olympiad Training program is for high school level competitors. AoPS designed these courses to help our top students get the deep focus they need to succeed in their specific competition goals. Check out the details at this link for all our WOOT programs in math, computer science, chemistry, and physics.

Looking for summer camps in math and language arts? Be sure to check out the video-based summer camps offered at the Virtual Campus that are 2- to 4-weeks in duration. 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 events:
[list][*]April 3rd (Webinar), 4pm PT/7:00pm ET, Learning with AoPS: Perspectives from a Parent, Math Camp Instructor, and University Professor
[*]April 8th (Math Jam), 4:30pm PT/7:30pm ET, 2025 MATHCOUNTS State Discussion
April 9th (Webinar), 4:00pm PT/7:00pm ET, Learn about Video-based Summer Camps at the Virtual Campus
[*]April 10th (Math Jam), 4:30pm PT/7:30pm ET, 2025 MathILy and MathILy-Er Math Jam: Multibackwards Numbers
[*]April 22nd (Webinar), 4:00pm PT/7:00pm ET, Competitive Programming at AoPS (USACO).[/list]
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0 replies
jlacosta
Apr 2, 2025
0 replies
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Find the domain and range of $f(x)=\frac{1}{1-2\cos x}.$
Vulch   1
N an hour ago by aidan0626
Find the domain and range of $f(x)=\frac{1}{1-2\cos x}.$
1 reply
Vulch
an hour ago
aidan0626
an hour ago
J
H
Find the domain and range of $f(x)=\frac{4-x}{x-4}.$
Vulch   1
N an hour ago by aidan0626
Find the domain and range of $f(x)=\frac{4-x}{x-4}.$
1 reply
Vulch
an hour ago
aidan0626
an hour ago
J
H
Find the domain and range of $f(x)=2-|x-5|.$
Vulch   0
an hour ago
Find the domain and range of $f(x)=2-|x-5|.$
0 replies
Vulch
an hour ago
0 replies
J
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Inequalities
sqing   5
N 2 hours ago by pooh123
Let $a,b,c> 0$ and $\frac{1}{a}+\frac{1}{b}+\frac{1}{c}=1.$ Prove that
$$ (1-abc) (1-a)(1-b)(1-c) \ge 208 $$$$ (1+abc) (1-a)(1-b)(1-c) \le -224 $$$$(1+a^2b^2c^2) (1-a)(1-b)(1-c) \le -5840 $$
5 replies
+1 w
sqing
Jul 12, 2024
pooh123
2 hours ago
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No more topics!
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AL=BL wanted, right triangle,<ALK=90^o (2015 Kurchatov Olympiad 7 p4 - Russia)
parmenides51   0
Mar 8, 2021
In a right-angled triangle $ABC$, angle bisector $AL$ was drawn and a a point $K$ was marked on the hypotenuse $AB$ such such that $AB = 3BK$. It turned out that the angle $ALK$ is right . Prove that $AL = BL$.
0 replies
parmenides51
Mar 8, 2021
0 replies
J
AL=BL wanted, right triangle,<ALK=90^o (2015 Kurchatov Olympiad 7 p4 - Russia)
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Reveal topic tags
geometry
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right triangle
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parmenides51
30650 posts
parmenides51
#1 h  Mar 8, 2021, 5:53 AM
Y by
In a right-angled triangle $ABC$, angle bisector $AL$ was drawn and a a point $K$ was marked on the hypotenuse $AB$ such such that $AB = 3BK$. It turned out that the angle $ALK$ is right . Prove that $AL = BL$.
This post has been edited 2 times. Last edited by parmenides51, Mar 8, 2021, 7:50 AM
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