DLMF:3.5.E45 (Q1301)

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DLMF:3.5.E45
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    erfc λ = e - λ 2 2 π - π π e - λ 2 tan 2 ( 1 2 θ ) d θ . complementary-error-function 𝜆 superscript 𝑒 superscript 𝜆 2 2 superscript subscript superscript 𝑒 superscript 𝜆 2 2 1 2 𝜃 𝜃 {\displaystyle{\displaystyle\operatorname{erfc}\lambda=\frac{e^{-\lambda^{2}}}% {2\pi}\int_{-\pi}^{\pi}e^{-\lambda^{2}{\tan^{2}}\left(\frac{1}{2}\theta\right)% }\mathrm{d}\theta.}}
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