DLMF:4.21.E38 (Q1742)

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DLMF:4.21.E38
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    Statements

    Defining formula
    cos ⁡ z = cos ⁡ x ⁢ cosh ⁡ y - i ⁢ sin ⁡ x ⁢ sinh ⁡ y , 𝑧 𝑥 𝑦 imaginary-unit 𝑥 𝑦 {\displaystyle{\displaystyle\cos z=\cos x\cosh y-\mathrm{i}\sin x\sinh y,}}
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    DLMF id
    DLMF:4.21.E38
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