General Solutions of sin θ = sin α, cos θ = cos α, tan θ = tan α

sin θ = sin α

θ = nπ + (−1)nα, where n ∈ Z

cos θ = cos α

θ = 2nπ ± α, n ∈ Z

tan θ = tan α

θ = nπ + α, n ∈ Z