DLMF:18.5#Ex3 (Q5524)

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DLMF:18.5#Ex3
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    Defining formula
    T 2 ⁡ ( x ) = 2 ⁢ x 2 - 1 , Chebyshev-polynomial-first-kind-T 2 𝑥 2 superscript 𝑥 2 1 {\displaystyle{\displaystyle T_{2}\left(x\right)=2x^{2}-1,}}
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    DLMF id
    DLMF:18.5#Ex3
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