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Problem 400: (2023 AMC12A, 25)
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 $a_{2023}?$ $\textbf{(A) } -2023 \qquad$ $\textbf{(B) } -2022 \qquad$ $\textbf{(C) } -1 \qquad$ $\textbf{(D) } 1 \qquad$ $\textbf{(E) } 2023$
Solution
Exercise 400: Solution
There is a unique sequence of integers $a_1,\dots,a_{2025}$ such that $\tan2025x=\dfrac{a_1\tan x+a_3\tan^3x+\cdots+a_{2025}\tan^{2025}x}{1+a_2\tan^2x+\cdots+a_{2024}\tan^{2024}x}$ whenever $\tan2025x$ is defined. What is $a_{2025}$?
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