Question

I see Q2, -1/2 220 degree and Q3, -1/2 on 210 degree..

Answer 1

In the given unit circle, the x coordinate gives the cos value of an angle and the y cooridnate gives the sine value of an angle.

The sine and cosine value of a particular angle is,

`\frac{-\sqrt[]{2}}{2}`

From the given unit circle

`\begin{gathered} \cos (3\pi)/(4)=\frac{-\sqrt[]{2}}{2} \\ \sin (5π)/(4)=\frac{-\sqrt[]{2}}{2} \end{gathered}`