- Montrer que $(u_n)_{n \geq 2}$ et $(v_n)_{n \geq 2}$ sont adjacentes.
Soit $(u_n)_{n \geq 2}$ et $(v_n)_{n \geq 2}$ les suites définies par :
\[ u_n = 2^{n+1} \sin \frac{\pi}{2^{n+1}} \quad \text{et} \quad v_n = 2^{n+1} \tan \frac{\pi}{2^{n+1}} \]
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