2 tan θ sec2 θ 4 July 8, 2019 16 32 64 128 4 2 2 1 cos sec tan θ θ θ Sec 4 θ sec 2 θ tan 4 θ tan 2 θ 4 tan(θ) + sec2(θ) = 6 Sec 4 θ−sec 2 θ=tan 2 θ+tan 2 θ