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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 =

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.

$\frac{1}{\cos\theta}=\frac{\sqrt2}{1}$