Learn how to evaluate for the secant of a negative angle using the unit circle

The video tutorial explains how to understand angles and reference angles, particularly focusing on 150 degrees and its reference angle of 30 degrees. It discusses the use of the unit circle to visualize angles and reflections about the axes. The tutorial also covers how to calculate the secant of an angle by using the reciprocal of the cosine and rationalizing the denominator.

What is the reference angle for 150 degrees?

• 45 degrees

• 30 degrees

• 60 degrees

• 90 degrees

How is the angle of 150 degrees represented on the coordinate plane?

• Reflection about the X-axis

• Reflection about the Y-axis

• Reflection about both X and Y axes

• No reflection

What are the coordinates of the angle 150 degrees on the unit circle?

• (sqrt 3 / 2, 1/2)

• (1/2, sqrt 3 / 2)

• (-sqrt 3 / 2, 1/2)

• (-sqrt 3 / 2, -1/2)

What is the formula for secant of an angle?

• X / Y

• 1 / X

• Y / X

• 1 / Y

How do you simplify the expression for secant when the X coordinate is -sqrt 3 / 2?

• -2 / sqrt 3

• 2 sqrt 3 / 3

• -2 sqrt 3 / 3

• -sqrt 3 / 2