DLMF:10.23#Ex1 (Q3458)

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DLMF:10.23#Ex1
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    Defining formula
    w = u 2 + v 2 - 2 ⁢ u ⁢ v ⁢ cos ⁡ α , 𝑤 superscript 𝑢 2 superscript 𝑣 2 2 𝑢 𝑣 𝛼 {\displaystyle{\displaystyle w=\sqrt{u^{2}+v^{2}-2uv\cos\alpha},}}
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    DLMF id
    DLMF:10.23#Ex1
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