DLMF:4.21.E28 (Q1730)

From DRMF

Revision as of 18:26, 1 January 2020 by Admin (talk | contribs) (‎Changed an Item: Add constraint)

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

Jump to navigation Jump to search

No description defined

Language	Label	Description	Also known as
English	DLMF:4.21.E28	No description defined

Statements

Defining formula

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

0 references

DLMF:4.21.E28

0 references

cosine function

Defining formula

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

C4.S14.E2.m2asdec

0 references

Defining formula

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

C4.S14.E1.m2ardec

0 references

Sitelinks

Wikipedia(0 entries)

DRMF related sites(0 entries)

Retrieved from "https://drmf-beta.wmflabs.org/index.php?title=Item:Q1730&oldid=27276"