The graph of y = cos (θ) is shown for values of θ between -360° and 540°. The blue point shows that cos (180°) = -1. For which other values of θ in this interval will cos (θ) = -1?

A. θ = -180° and θ = 540°
B. θ = 0° and θ = 360°
C. θ = -90° and θ = 270°
D. θ = -180° and θ = 360°

the graph-- http://www.explorelearning.com/ELContent/gizmos/ELMath_Deliverable/ExplorationGuides/Algebra/images/EL_A2_CosFunction1.gif

Question

The graph of y = cos (θ) is shown for values of θ between -360° and 540°. The blue point shows that cos (180°) = -1. For which other values of θ in this interval will cos (θ) = -1?

 A. θ = -180° and θ = 540°
 B. θ = 0° and θ = 360°
 C. θ = -90° and θ = 270°
 D. θ = -180° and θ = 360°

the graph--> http://www.explorelearning.com/ELContent/gizmos/ELMath_Deliverable/ExplorationGuides/Algebra/images/EL_A2_CosFunction1.gif

sweetburger · Answer

the simple answer is A. but just so you can see it its when the graph hits -1

anonymous · Answer

Thank you so much!