Question

$2cosx + {} \sqrt{3 = 0}$

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Answer 1

$2Cosx+\sqrt{3}=0\\\\2Cosx=-\sqrt{3}\\\\Cosx=-\frac{\sqrt{3} }{2}\\\\x=\pm arcCos(-\frac{\sqrt{3} }{2})+2\pi n,n\in z\\\\x=\pm \frac{5\pi }{6}+2\pi n,n\in z$