Black Gibson
05/22/2023 · Primary School

\( 2+2 \cos \left(2 x+\frac{2 \pi}{3}\right)=2+\sqrt{3} \), ce qui simplifie en \( 2 \cos \left(2 x+\frac{2 \pi}{3}\right)=\sqrt{3} \). Donc, \( \cos \left(2 x+\frac{2 \pi}{3}\right)=\frac{\sqrt{3}}{2} \). Les solutions générales sont \( 2 x+\frac{2 \pi}{3}= \pm \frac{\pi}{6}+2 k \pi \), avec \( k \in \mathbb{Z} \). On résout pour \( \mathrm{x}: 2 x=-\frac{\pi}{2}+2 k \pi \) ou \( 2 x=-\frac{\pi}{2}+2 k \pi \). Donc \( x=-\frac{\pi}{4}+k \pi \) ou \( x=-\frac{\pi}{2}+k \pi \). Pour \( x \in[-\pi, \pi] \), les solutions sont \( x=-\frac{\pi}{4}, \frac{3 \pi}{4},-\frac{\pi}{2}, \frac{\pi}{2} \). Répondre: Les solutions dans \( [-\pi, \pi] \) sont \( -\frac{\pi}{4}, \frac{3 \pi}{4},-\frac{\pi}{2}, \frac{\pi}{2} \).

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Les solutions dans \( [-\pi, \pi] \) sont \( -\frac{\pi}{4}, \frac{3\pi}{4}, -\frac{\pi}{2}, \frac{\pi}{2} \).

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