[tex]3 - \sin {}^{2} (\pi) - 2 \cos( \frac{\pi}{6} ) + 3 \tg( \frac{\pi}{3} ) - 4 \ctg( \frac{\pi}{2} ) = \\ 3 - 0 {}^{2} - 2 \times \frac{ \sqrt{3} }{2} + 3 \sqrt{3} - 4 \times 0 = \\ 3 - \sqrt{3} + 3 \sqrt{3 } = 3 + 2 \sqrt{3} [/tex]
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[tex]3 - \sin {}^{2} (\pi) - 2 \cos( \frac{\pi}{6} ) + 3 \tg( \frac{\pi}{3} ) - 4 \ctg( \frac{\pi}{2} ) = \\ 3 - 0 {}^{2} - 2 \times \frac{ \sqrt{3} }{2} + 3 \sqrt{3} - 4 \times 0 = \\ 3 - \sqrt{3} + 3 \sqrt{3 } = 3 + 2 \sqrt{3} [/tex]