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Equation Icon  + 2 𝜃 F (𝜃,ψ) = sin 2 cos 2ψ, (64 ) 𝜃 F× (𝜃,ψ) = − sin2 -sin2 ψ, (65 ) 2 F x(𝜃,ψ) = − 1--sin2𝜃---cosψ, (66 ) 2 1 + cos𝜃 y 1 sin 2𝜃 F (𝜃,ψ) = -----------sin ψ, (67 ) 2 1 + cos𝜃 F b(𝜃) = sin2 𝜃-, (68 ) 2 ℓ 1 cos2 𝜃 F (𝜃) = -----------. (69 ) 2 1 + cos𝜃