Hightlight of the week

• 2024/10/14 New official mock test from AOPS

  2024/10/01 New problem set made by high quality contests created by wikjay, ijco, and megahertz13

  2024/09/24 You can now do AMC mock tests with high quality contests created by AOPS community

  2024/09/23 Video tutorial parent guide how to use the website

  2024/09/23 We added 500 new questions to Math Trainer, you can practice all questions from the famouse CEMC (Waterloo, Canada) Math Contest

  2024/09/14 New Math Trainer, you can practice your quest and your own practice problems

  2024/09/05 New Berkeley Math tournament contests now available

  2024/09/01 Start doing online contest and boost your contest rating. Congrats Yin Lam (1743), Emerio Diaziii (1682), John (1682),

Problem of the day

There is a unique sequence of integers $a_1, a_2, \cdots a_{2023}$ such that\[\tan2023x = \frac{a_1 \tan x + a_3 \tan^3 x + a_5 \tan^5 x + \cdots + a_{2023} \tan^{2023} x}{1 + a_2 \tan^2 x + a_4 \tan^4 x \cdots + a_{2022} \tan^{2022} x}\]whenever $\tan 2023x$ is defined. What is $a_{2023}?$ $\textbf{(A) } -2023 \qquad\textbf{(B) } -2022 \qquad\textbf{(C) } -1 \qquad\textbf{(D) } 1 \qquad\textbf{(E) } 2023$

Latest update

• 2024/08/28 Checkout new AMC 10 Counting Mock test 1
• 2024/08/18 Checkout Competify test 3 contest for grade 9-12
• 2024/08/18 Congratulations to BoredApe, Justin Kchao for a successfully Competify contest Test 2 (leaderboard)
• 2024/08/13 Checkout 100 new questions in AMC 8 Number Theory
• Take the brand new AMC 8 algebra test and earn reward
• Earn your reward by doing quest video tutorial.
• New challenge for 5-8 grade Competify challenge Set 2!!!.
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• August 2024: Try our new AMC 10 courses version 2.

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