The point #(-4,1)# is on the terminal side of an angle in standard position, how do you determine the exact values of the six trigonometric functions of the angle?
Point (x = -4, y = 1) on the terminal side is in the Quadrant 2.
Call t the angle (arc):
Since t lies in Quadrant 2 --> cos t is negative.
Since t lies in Quadrant 2 --> sin t is positive