# Documentation/Calc Functions/COS

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COS

Matematisk

## Resume:

Returnerer cosinus af den givne vinkel (i radianer).

COS(Number)

## Returnerer:

Returnerer den (trigonometriske) cosinus af taller, vinklen i radianer. Den resulterende værdi er mellem -1 og 1, dvs. [-1,1].

## Argumenter:

Tallet er det reelle tal, eller en reference til en celle, der indeholder tallet, som er vinklen i radianer, hvis cosinus skal beregnes.

• If Number is non-numeric, then COS reports a #VÆRDI! error.

## Yderligere oplysninger:

For at indsætte en vinkel i grader, multiplicerer du enten vinklen med PI()/180 eller bruger funktionen RADIANER til at konvertere vinklen til radianer.

The formula for the trigonometric cosine of x is:

$\displaystyle{ \cos(x)~=~\sum_{n=0}^{\infty }\frac{(-1)^{n}}{(2n)!}~x^{2n} }$

GIFen herunder illustrerer funktionen COS:

Funktionen COS

## Eksempler:

Formel Beskrivelse Returnerer
=COS(1) Trigonometric cosine of 1 radian. 0,54030230586814
=COS(D1) where cell D1 contains the number -0.5. Trigonometric cosine of -½ radian. 0,877582561890373
=COS(PI()*2) Trigonometric cosine of 2π radians. 1
=COS(RADIANER(60)) Trigonometric cosine of 60°, after first converting the angle from degrees to radians. 0,5
=GRADER(ARCCOS(COS(RADIANER(60))) An angle of 60° is converted to radians, its cosine is taken, then the inverse cosine of that value is calculated, and finally the result is converted back to degrees. 60

COS