Вычислите tg 5π/4*ctg 7π/4+tg 7π/6*ctg 11π/6.

\[= 1 \cdot ( - 1) + \frac{1}{\sqrt{3}} \cdot \left( - \frac{1}{\sqrt{3}} \right) =\]

\[= - 1 - \frac{1}{3} = - 1\frac{1}{3}\]