DLMF:4.14.E2 (Q1654)

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DLMF:4.14.E2
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    cos ⁡ z = e i ⁢ z + e - i ⁢ z 2 , 𝑧 superscript 𝑒 imaginary-unit 𝑧 superscript 𝑒 imaginary-unit 𝑧 2 {\displaystyle{\displaystyle\cos z=\frac{e^{\mathrm{i}z}+e^{-\mathrm{i}z}}{2},}}
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    DLMF id
    DLMF:4.14.E2
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