Question

найдите значение выражения

Answer 1

$\displaystyle\bf\\4Sin\Big(-\frac{\pi }{6} \Big) Cos\frac{\pi }{3} +Cos\frac{3\pi }{2} -\sqrt{2} Cos\frac{\pi }{4} =4\cdot\Big(-\frac{1}{2} \Big)\cdot\frac{1}{2} +0-\sqrt{2} \cdot\frac{1}{\sqrt{2} } =\\\\\\=-1-1=-2$