Вычисли синус, косинус и тангенс угла $120\degree$. $cos 120\degree$ $=$ $cos (90\degree $ $\degree$$ ) =$ $\degree =$ $\dfrac{1}{2}$. $sin 120\degree = sin (180\degree $ $\degree) =$ $\degree =$ $\dfrac{\sqrt3}{2}$. $tg 120\degree =sin $ $\degree : cos$ $\degree =$ $\sqrt 3$.
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Задание

Вычисли синус, косинус и тангенс угла \(120\degree\).

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\(cos 120\degree\) \(=\) \(cos (90\degree \) [+|-] [30|60|90|120]\(\degree\)\( ) =\) [+|-] [sin |cos|tg][30|60|90|120]\(\degree =\) [+|-] \(\dfrac{1}{2}\).

\(sin 120\degree = sin (180\degree \)[+|-] [30|60|90|120]\(\degree) =\) [+|-][sin|cos|tg][30|60|90|120]\(\degree =\) [+|-]\(\dfrac{\sqrt3}{2}\).

\(tg 120\degree =sin \) [30|60|90|120] \(\degree : cos\) [30|60|90|120] \(\degree =\) [+|-] \(\sqrt 3\).

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