Practice problem
Find an angle θ\thetaθ with 0<θ<360∘0<\theta<360^{\circ}0<θ<360∘ or 0<θ<2π0<\theta<2\pi0<θ<2π that has the same cosine value as 140∘140^{\circ}140∘
0.643
-0.643
0.766
-0.766
Type a concept, like “slope” or “photosynthesis”.