\dfrac{\sqrt{2}}{2} -\dfrac{\sqrt{2}}{2} \dfrac{\sqrt{3}}{2} -\dfrac{\sqrt{3}}{2} 1+\dfrac{\sqrt{3}}{2} 1-\dfrac{\sqrt{3}}{2} \dfrac{\sqrt{3}}{2}-1 \cos^2\dfrac{\pi}{8}-\sin^2\dfrac{\pi}{8}= 1-2\sin^275\degree= 2\cos^215\degree=

Задание

Вычисли

\(\dfrac{\sqrt{2}}{2}\)
\(-\dfrac{\sqrt{2}}{2}\)
\(\dfrac{\sqrt{3}}{2}\)
\(-\dfrac{\sqrt{3}}{2}\)
\(1+\dfrac{\sqrt{3}}{2}\)
\(1-\dfrac{\sqrt{3}}{2}\)
\(\dfrac{\sqrt{3}}{2}-1\)

\(\cos^2\dfrac{\pi}{8}-\sin^2\dfrac{\pi}{8}=\) [ ]

\(1-2\sin^275\degree=\) [ ]

\(2\cos^215\degree=\) [ ]