Question

$3arcsin \frac{1}{2} - arctg( - \frac{ \sqrt{3} }{3} )$
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Answer 1

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