Evaluating Trigonometric Functions Using the Reference Angle (6.3.2)

Question 1

• The reference angle for an angle θ is the positive, acute angle made by the terminal side of θ and the x-axis.

Answer 1

• The reference angle for an angle θ is the positive, acute angle made by the terminal side of θ and the x-axis.

Question 2

• To find the value of a trig function for an angle θ using its reference angle:

1. Find the value of the trig function for the reference angle.
2. Change the sign appropriately depending on which quadrantθ is in.

Answer 2

• To find the value of a trig function for an angle θ using its reference angle:

1. Find the value of the trig function for the reference angle.
2. Change the sign appropriately depending on which quadrantθ is in.