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Home > PC > Chapter 4 > Lesson 4.3.2 > Problem 4-138

4-138.
  1. Find all values of θ where 0 ≤ θ < 2π, such that the following equations are true. Use exact values for θ. Homework Help ✎

    1. cos θ = 1

    2. tan θ = −1

    3. csc θ = 2

    4. sec θ = square root of 2

Cosine is the x-value. Where on the unit circle is x = 1?

What θ gives a tangent of 1 or −1?
What quadrants would the tangent be −1?

Change the csc θ to 1/sin θ.