1. Objectives:
1.
Use reference angles and special
angles to evaluate sine and cosine
functions
2.
Graph sine and cosine functions.

2.  The
reference angle for any angle θ
is:
 the positive acute
angle formed by
the terminal ray
of θ and the
x-axis.

3.  We
can evaluate any trig function for
any angle by using its reference
angle.
 Determine the sign by quadrant.
 Remember: “All Students Take
Calculus!”

4.  Express
sin 695 in terms of a
reference angle.

5.  Express
cos 200 in terms of a
reference angle.

7.  Evaluate
each without looking at the
unit circle. (Use the reference angle!)

8.  Evaluate
each without looking at the
unit circle.

9. θ
sin θ
0
π/4
π/2
3π/4
π
1
-1

10. θ
cos θ
0
π/4
π/2
3π/4
π
1
-1