Using skeeter's neat diagram,
you need to locate the angles
and
corresponds to zero degrees on the extreme right on the x-axis where the circle touches the axis.
The co-ordinates are (1,0).
You can also obtain these by calculating and
The angle is a negative angle.
Positive angles are anticlockwise.
Negative angles are clockwise.
Angles start from zero or .
means go radians clockwise, then another radians clockwise.
This causes us to end up at radians.
You can read off the co-ordinates of this position on the circle,
or you can use your calculator to calculate for the x co-ordinate, and for the y co-ordinate.
Why not try this and check that the co-ordinates calculated match skeeter's diagram.
Remember... x=Cos(angle), y=Sin(angle) on the unit circle.