DLMF:4.21.E38 (Q1742)

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DLMF:4.21.E38
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    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:4.21.E38
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    cos z 𝑧 {\displaystyle{\displaystyle\cos\NVar{z}}}
    C4.S14.E2.m2azdec
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