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Title: Multiple-Angle Formulas -- from Wolfram MathWorld

Open Graph Title: Multiple-Angle Formulas -- from Wolfram MathWorld

X Title: Multiple-Angle Formulas -- from Wolfram MathWorld

Description: For n a positive integer, expressions of the form sin(nx), cos(nx), and tan(nx) can be expressed in terms of sinx and cosx only using the Euler formula and binomial theorem. For sin(nx), sin(nx) = (e^(inx)-e^(-inx))/(2i) (1) = ((e^(ix))^n-(e^(-ix))^n)/(2i) (2) = ((cosx+isinx)^n-(cosx-isinx)^n)/(2i) (3) = sum_(k=0)^(n)(n; k)(cos^kx(isinx)^(n-k)-cos^kx(-isinx)^(n-k))/(2i) (4) = sum_(k=0)^(n)(n; k)cos^kxsin^(n-k)x(i^(n-k)-(-i)^(n-k))/(2i) (5) = sum_(k=0)^(n)(n;...

Open Graph Description: For n a positive integer, expressions of the form sin(nx), cos(nx), and tan(nx) can be expressed in terms of sinx and cosx only using the Euler formula and binomial theorem. For sin(nx), sin(nx) = (e^(inx)-e^(-inx))/(2i) (1) = ((e^(ix))^n-(e^(-ix))^n)/(2i) (2) = ((cosx+isinx)^n-(cosx-isinx)^n)/(2i) (3) = sum_(k=0)^(n)(n; k)(cos^kx(isinx)^(n-k)-cos^kx(-isinx)^(n-k))/(2i) (4) = sum_(k=0)^(n)(n; k)cos^kxsin^(n-k)x(i^(n-k)-(-i)^(n-k))/(2i) (5) = sum_(k=0)^(n)(n;...

X Description: For n a positive integer, expressions of the form sin(nx), cos(nx), and tan(nx) can be expressed in terms of sinx and cosx only using the Euler formula and binomial theorem. For sin(nx), sin(nx) = (e^(inx)-e^(-inx))/(2i) (1) = ((e^(ix))^n-(e^(-ix))^n)/(2i) (2) = ((cosx+isinx)^n-(cosx-isinx)^n)/(2i) (3) = sum_(k=0)^(n)(n; k)(cos^kx(isinx)^(n-k)-cos^kx(-isinx)^(n-k))/(2i) (4) = sum_(k=0)^(n)(n; k)cos^kxsin^(n-k)x(i^(n-k)-(-i)^(n-k))/(2i) (5) = sum_(k=0)^(n)(n;...

Opengraph URL: https://mathworld.wolfram.com/Multiple-AngleFormulas.html

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DC.TitleMultiple-Angle Formulas
DC.CreatorWeisstein, Eric W.
DC.DescriptionFor n a positive integer, expressions of the form sin(nx), cos(nx), and tan(nx) can be expressed in terms of sinx and cosx only using the Euler formula and binomial theorem. For sin(nx), sin(nx) = (e^(inx)-e^(-inx))/(2i) (1) = ((e^(ix))^n-(e^(-ix))^n)/(2i) (2) = ((cosx+isinx)^n-(cosx-isinx)^n)/(2i) (3) = sum_(k=0)^(n)(n; k)(cos^kx(isinx)^(n-k)-cos^kx(-isinx)^(n-k))/(2i) (4) = sum_(k=0)^(n)(n; k)cos^kxsin^(n-k)x(i^(n-k)-(-i)^(n-k))/(2i) (5) = sum_(k=0)^(n)(n;...
DC.Date.Created2000-02-28
DC.Date.Modified2008-06-05
DC.Subject51N
DC.RightsCopyright 1999-2026 Wolfram Research, Inc. See https://mathworld.wolfram.com/about/terms.html for a full terms of use statement.
DC.Formattext/html
DC.Identifierhttps://mathworld.wolfram.com/Multiple-AngleFormulas.html
DC.Languageen
DC.PublisherWolfram Research, Inc.
DC.Relation.IsPartOfhttps://mathworld.wolfram.com/
DC.TypeText
Last-Modified2008-06-05
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og:typewebsite
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