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Автор - Universalka

3arcSinfrac{1}{2}-arctg(-frac{sqrt{3}}{3})=3*frac{pi }{6}-(-frac{pi }{6})=frac{3pi }{6}+frac{pi }{6}=frac{4pi }{6}=frac{2pi}{3} \\Otvet:boxed{frac{2pi }{3}}

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