DLMF:4.21.E20 (Q1722)

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Language	Label	Description	Also known as
English	DLMF:4.21.E20	No description defined

Statements

Defining formula

{\displaystyle{\displaystyle{\cos^{2}}u-{\sin^{2}}v=\cos\left(u+v\right)\cos% \left(u-v\right).}}

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DLMF:4.21.E20

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cosine function

Defining formula

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

C4.S14.E2.m2amdec

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Defining formula

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

C4.S14.E1.m2amdec

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Sitelinks

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