Вычислите (cos 2π/3-sin 5π/6)*sin(-3,5π):cos(-7π/4).

\[= \left( - \frac{1}{2} - \frac{1}{2} \right) \cdot 1\ :\frac{\sqrt{2}}{2} =\]

\[= - 1 \cdot 1 \cdot \frac{\sqrt{2}}{2} = - \sqrt{2}\]