Trigonometric Functions of Any Angle
Signs of Function Values
We can tell the interval of the angle Ɵ from the signs of the coordinates of the given point. In the previous example, the point (-3,4) is in the second quadrant so the value of the angle Ɵ is between 90° and 180°. Also, we can deduce the signs of the trigonometric functions. The diagram shows the interval of the angle and the relationship with the signs of the x-values and y-values.
Reference Angles
The values of the trigonometric functions of angles greater than or less than can be determined from their values at corresponding acute angles called reference angles.
Learn more about trigonometric functions of any angle below.
Trigonometric Functions of Any Angle
Practice: Answer the following exercises about trigonometric functions of any angle.
Trigonometric Functions of Any Angle 1