The sine, cosine and tangent of 210o are respectively

The sine, cosine and tangent of 210o are respectively

Answer Details

210o = 180o - 210o = 30o
From ratio of sides, sin -30o = -$\frac{1}{2}$
Cos 210o = 180o - 210o = -30o
= cos -30o = $\frac{-3}{2}$
But tan 30o = $\frac{1}{3}$, rationalizing this
= $\frac{1}{3}$ x $\frac{3}{3}$ = $\frac{3}{3}$
∴ = $\frac{-1}{2}$, $\frac{\sqrt{-3}}{2}$, $\frac{\sqrt{3}}{3}$