DLMF:4.45.E16 (Q2025)

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DLMF:4.45.E16
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    Statements

    Defining formula
    e z = e ℜ ⁡ z ⁢ ( cos ⁡ ( ℑ ⁡ z ) + i ⁢ sin ⁡ ( ℑ ⁡ z ) ) . superscript 𝑒 𝑧 superscript 𝑒 𝑧 𝑧 𝑖 𝑧 {\displaystyle{\displaystyle e^{z}=e^{\Re z}(\cos\left(\Im z\right)+i\sin\left% (\Im z\right)).}}
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    DLMF id
    DLMF:4.45.E16
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    Symbols used
    cosine function
    Defining formula
    cos ⁡ z 𝑧 {\displaystyle{\displaystyle\cos\NVar{z}}}
    xml-id
    C4.S14.E2.m2aadec
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    base of natural logarithm
    Defining formula
    e {\displaystyle{\displaystyle\mathrm{e}}}
    xml-id
    C4.S2.E11.m2aadec
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    Q10901
    Defining formula
    ℑ ⁡ absent {\displaystyle{\displaystyle\Im}}
    xml-id
    C1.S9.E2.m2adec
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    imaginary unit
    Defining formula
    i imaginary-unit {\displaystyle{\displaystyle\mathrm{i}}}
    xml-id
    C1.S9.E1.m2aadec
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