# Documentation/Calc Functions/SEK

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SEK

Matematisk

## Resume:

Returnerer sekanten til en given vinkel (i radianer). Sekanten til en vinkel er lig med 1 divideret med vinlens cosinus.

SEK(Number)

## Returnerer:

Returnerer den (trigonometriske) sekant til tallet, tallet i radianer.

## Argumenter:

Tallet er et reelt tal eller en reference til den celle, der indeholder det tal, hvis sekant-værdi skal beregnes.

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

## Yderligere oplysninger:

• En vinkels sekant svarer til 1 divideret med vinklens cosinus.
• Til at indsætte en vinkel i grader, enten multiplicerer du vinklen med PI()/180 eller konverterer vinklen til radianer.
• Formlen for funktionen SEK er:

The formula for the trigonometric secant of x is:

$\displaystyle{ \sec(x)~=~\frac{1}{\cos(x)} }$

Mathematically, the secant of any odd multiple of π/2, i.e. {......-3π/2, -π/2, π/2, 3π/2.....} is undefined. However, because of the inherent inaccuracy in representing π numerically, SEK does not report errors for arguments close to these values. You should be aware that SEK will return large positive or negative results for odd multiples of π/2.

Figuren herunder illustrerer funktionen SEK.

SEC function

## Eksempler:

Formel Beskrivelse Returnerer
=SEK(1) Trigonometric secant of 1 radian. 1,85081571768093
=SEK(D1) where cell D1 contains the number -2. Trigonometric secant of -2 radians. −2,40299796172238
=SEK(PI()/4) Trigonometric secant of π/4 radians. 1,4142135623731
=SEK(RADIANER(60)) Trigonometric secant of 60°, after first converting the angle from degrees to radians. 2

## Relaterede (eller lignende) Excel-funktioner:

SEC since v.2013.