θ=0∘\theta=0^{\circ}θ=0∘
θ=45∘\theta=45^{\circ}θ=45∘
θ=0∘ and 45∘\theta=0^{\circ} \text { and } 45^{\circ}θ=0∘ and 45∘
None of these \text { None of these } None of these
