DLMF:6.5.E6 (Q2246)

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DLMF:6.5.E6
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    test
    Ci ⁡ ( z ) = - 1 2 ⁢ ( E 1 ⁡ ( i ⁢ z ) + E 1 ⁡ ( - i ⁢ z ) ) , cosine-integral 𝑧 1 2 exponential-integral 𝑖 𝑧 exponential-integral 𝑖 𝑧 {\displaystyle{\displaystyle\mathrm{Ci}\left(z\right)=-\tfrac{1}{2}(E_{1}\left% (iz\right)+E_{1}\left(-iz\right)),}}
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    DLMF id
    DLMF:6.5.E6
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