решите срочно
[tex]1) sin x = - \frac{ \sqrt{3} }{2} \\ 2) \: 2cos(5x + \frac{\pi}{3} ) + \sqrt{2} = 0 \\ 3) \: 4 {cos}^{2} x - 8cos \: x + 3 = 0[/tex]
тригонометричні рівняння​
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