Trigonometry
Write the following expression in terms of θ\thetaθ only. Use the identity for the cosine of a sum.
cos(360∘+θ)\cos\left(360^{\circ}+\theta\right)cos(360∘+θ)
−2cosθ-2\cos\theta−2cosθ
cosθ−sinθ\cos\theta-\sin\thetacosθ−sinθ
sinθ\sin\thetasinθ
cosθ\cos\thetacosθ