Goniometrické funkce

Sinus

  • sin x=cos x tg x
  • sin x={{cos x}/{cotg x}}
  • sin (-x)=-sin x
  • sin^2 x + cos^2 x=1
  • delim{|}{sin x}{|}=sqrt{1-cos^2 x}
  • sin (x+y)=sin x cos y + cos x sin y
  • sin (x-y)=sin x cos y - cos x sin y
  • sin 2x=2sin x cos x
  • delim{|}{sin{x/y}}{|}=sqrt{{1-cos x}/2}
  • sin x+sin y=2sin{{x+y}/2}cos {{x+y}/2}
  • sin x-sin y=2cos{{x+y}/2}sin {{x-y}/2}

Cosinus

  • cos x=sin xcotg x
  • cos x={{sin x}/{tg x}}
  • cos (-x)=cos x
  • cos (x+y)=cos x cos y-sin x sin y
  • cos (x-y)=cos x cos y+sin x sin y
  • delim{|}{cos x}{|}=sqrt{1-sin^2 x}
  • cos x={{1-sin^2 x}/{cos x}}
  • delim{|}{cos{x/y}}{|}=sqrt{{1+cos x}/2}
  • cos x+cos y=2cos{{x+y}/2}cos{{x-y}/2}
  • cos x-cos y=-2sin{{x+y}/2}sin{{x-y}/2}
  • cos^2 x+sin^2 x=1
  • cos 2x=cos^2 x - sin^2 x

Tangens

  • tg x={{sin x}/{cos x}}
  • tg (-x)=-tg x
  • tg (x+y)={{tg x+tg y}/{1+tg x tg y}}
  • tg (x-y)={{tg x-tg y}/{1+tg x tg y}}
  • tg 2x={{2tg x}/{1-tg^2 x}}
  • delim{|}{tg{x/y}}{|}=sqrt{{1-cos x}/{1+cos x}}
  • 1+tg^2 x={1/{cos^2 x}}

Kotangens

  • cotg x={cos x/sin x}
  • cotg (-x)=-cotg x
  • cotg x={1/{tg x}}
  • 1+cotg^2 x={1/{sin^2 x}}
 
/home/free/wu.cz/t/tomas-lang/root/www/data/pages/matematika/funkce/goniometricke.txt · Poslední úprava: 2007/04/12 14:28 autor: tomas
 
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