DLMF:4.21.E42 (Q1746): Difference between revisions

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DLMF:4.21.E42
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    Defining formula
    | cos ⁡ z | = ( cos 2 ⁡ x + sinh 2 ⁡ y ) 1 / 2 = ( 1 2 ⁢ ( cosh ⁡ ( 2 ⁢ y ) + cos ⁡ ( 2 ⁢ x ) ) ) 1 / 2 , 𝑧 superscript 2 𝑥 2 𝑦 1 2 superscript 1 2 2 𝑦 2 𝑥 1 2 {\displaystyle{\displaystyle|\cos z|=({\cos^{2}}x+{\sinh^{2}}y)^{1/2}=\left(% \tfrac{1}{2}(\cosh\left(2y\right)+\cos\left(2x\right))\right)^{1/2},}}
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    DLMF id
    DLMF:4.21.E42
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