Home > PC > Chapter 4 > Lesson 4.3.1 > Problem 4-128
4-128.
Find the exact value of each of the following trig expressions.
sin
1. Plot the point on a unit circle.
2. Find the sides of this special triangle.
3. Be careful of the signs!
4. Write the answer.
cos
bring the point back to .
cot
Wrap clockwise because of the negative sign.
sec
Since the sec\theta; is, this would be undefined because the at .