Question

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

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Answer 1

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