Understand and use the identities for sin(θ±ϕ)\sin{(θ \pm ϕ)}sin(θ±ϕ), cos(θ±ϕ)\cos{(θ \pm ϕ)}cos(θ±ϕ), tan(θ±ϕ)\tan{(θ \pm ϕ)}tan(θ±ϕ).*Includes understanding geometric proofs. The starting point for the proof will be given.Excludes: Proofs using de Moivre’s theorem will not be accepted.*
