DLMF:22.18#Ex5 (Q7173)

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DLMF:22.18#Ex5
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    Defining formula
    x 3 = x 1 ⁢ y 2 + x 2 ⁢ y 1 1 - k 2 ⁢ x 1 2 ⁢ x 2 2 , subscript 𝑥 3 subscript 𝑥 1 subscript 𝑦 2 subscript 𝑥 2 subscript 𝑦 1 1 superscript 𝑘 2 superscript subscript 𝑥 1 2 superscript subscript 𝑥 2 2 {\displaystyle{\displaystyle x_{3}=\frac{x_{1}y_{2}+x_{2}y_{1}}{1-k^{2}x_{1}^{% 2}x_{2}^{2}},}}
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    DLMF:22.18#Ex5
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    Warning: Falling back to standard tex;
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