DLMF:4.28.E9 (Q1846)

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DLMF:4.28.E9
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    cos ( i z ) = cosh z , 𝑖 𝑧 𝑧 {\displaystyle{\displaystyle\cos\left(iz\right)=\cosh z,}}
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    DLMF:4.28.E9
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    cos z 𝑧 {\displaystyle{\displaystyle\cos\NVar{z}}}
    C4.S14.E2.m2adec
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