DLMF:31.16#Ex1 (Q9133)

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DLMF:31.16#Ex1
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    Defining formula
    x ⁢ y = a ⁢ sin 2 ⁢ θ ⁢ cos 2 ⁡ ϕ , 𝑥 𝑦 𝑎 2 𝜃 2 italic-ϕ {\displaystyle{\displaystyle xy=a{\sin^{2}}\theta{\cos^{2}}\phi,}}
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    DLMF id
    DLMF:31.16#Ex1
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