DLMF:4.21.E23 (Q1725)

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Language	Label	Description	Also known as
English	DLMF:4.21.E23	No description defined

Statements

Defining formula

{\displaystyle{\displaystyle\tan\frac{z}{2}=\pm\left(\frac{1-\cos z}{1+\cos z}% \right)^{1/2}=\frac{1-\cos z}{\sin z}=\frac{\sin z}{1+\cos z}.}}

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DLMF:4.21.E23

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cosine function

Defining formula

{\displaystyle{\displaystyle\cos\NVar{z}}}

C4.S14.E2.m2apdec

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Defining formula

{\displaystyle{\displaystyle\sin\NVar{z}}}

C4.S14.E1.m2aodec

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tangent function

Defining formula

{\displaystyle{\displaystyle\tan\NVar{z}}}

C4.S14.E4.m2acdec

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Defining formula

{\displaystyle{\displaystyle z}}

C4.S1.XMD8.m1edec

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Sitelinks

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