DLMF:4.21#Ex2 (Q1739)

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DLMF:4.21#Ex2
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    Defining formula
    cos ⁡ z = 1 - t 2 1 + t 2 , 𝑧 1 superscript 𝑡 2 1 superscript 𝑡 2 {\displaystyle{\displaystyle\cos z=\frac{1-t^{2}}{1+t^{2}},}}
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    DLMF id
    DLMF:4.21#Ex2
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