DLMF:4.18.E8 (Q1676)

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DLMF:4.18.E8
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    | cos z | cosh | z | , 𝑧 𝑧 {\displaystyle{\displaystyle|\cos z|\leq\cosh|z|,}}
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    DLMF:4.18.E8
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    cos z 𝑧 {\displaystyle{\displaystyle\cos\NVar{z}}}
    C4.S14.E2.m2abdec
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    cosh z 𝑧 {\displaystyle{\displaystyle\cosh\NVar{z}}}
    C4.S28.E2.m2abdec
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