DLMF:18.5#Ex10 (Q5531)

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DLMF:18.5#Ex10
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    Defining formula
    U 2 ⁡ ( x ) = 4 ⁢ x 2 - 1 , Chebyshev-polynomial-second-kind-U 2 𝑥 4 superscript 𝑥 2 1 {\displaystyle{\displaystyle U_{2}\left(x\right)=4x^{2}-1,}}
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    DLMF:18.5#Ex10
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