[tex]4 \times 2 {}^{cosx} = \sqrt{8} [/tex]
[tex] {2}^{2 + cosx} = 2 {}^{ \frac{3}{2} }[/tex]
[tex]2 + cosx = \frac{3}{2} [/tex]
[tex]cosx = \frac{3}{2} - 2[/tex]
[tex]cosx = - \frac{1}{2} [/tex]
[tex]x = \frac{2\pi}{3} \\ x = \frac{4\pi}{3} [/tex]
[tex]Ответ: \\ x = \frac{2\pi}{3} + 2k\pi,kЄZ \\ x = \frac{4\pi}{3} + 2k\pi,kЄZ[/tex]
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Розв'яжіть рівняння:
[tex]4 \times 2 {}^{cosx} = \sqrt{8} [/tex]
[tex] {2}^{2 + cosx} = 2 {}^{ \frac{3}{2} }[/tex]
[tex]2 + cosx = \frac{3}{2} [/tex]
[tex]cosx = \frac{3}{2} - 2[/tex]
[tex]cosx = - \frac{1}{2} [/tex]
[tex]x = \frac{2\pi}{3} \\ x = \frac{4\pi}{3} [/tex]
[tex]Ответ: \\ x = \frac{2\pi}{3} + 2k\pi,kЄZ \\ x = \frac{4\pi}{3} + 2k\pi,kЄZ[/tex]