Find the value of cos(θ+π)\cos(\theta + \pi)cos(θ+π) in terms of cos(θ)\cos(\theta)cos(θ).
−cos(θ)-\cos(\theta)−cos(θ)
cos(θ)\cos(\theta)cos(θ)
sin(θ)\sin(\theta)sin(θ)
−sin(θ)-\sin(\theta)−sin(θ)