The number pi/4 determines a point on the unit circle with coordinates (sqrt(2)/2 , sqrt(2)/2). what are:?

Question

the coordinates of the point determined by -pi/4?

use radicals as needed

Answer 1

sqrt(2)/2, -sqrt(2)/2

Answer 2

This is the beginning of polar coordinates. Where pi/4 is the measurement in radians of the angle formed with the line in question that starts at the origin (0.0) and the postive x axis. The convention is postive is counter-clockwise and negative is clockwise. The result of negative pi/4 would be rotated clockwise one eighth of a circle (or 45 degrees) below the x axis and still in positive x territory.
(sqrt(2)/2,-sqrt(2)/2)

Answer 3

(2)/2 , -sqrt(2)/2).