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Home > PC > Chapter 4 > Lesson 4.1.3 > Problem 4-41

4-41.
  1. Find the exact values of the following trig expressions. Homework Help ✎

    1. cos

    2. sin

    3. sin

    4. tan

1. This is the 2nd quadrant.
2. Cosine is the x-value.
3. Cosine is negative in the 2nd quadrant.

1. Sine is y-value.
2. What are the side lengths?
3. Is it positive or negative?

2. Watch your signs!