# Manuals/calci/DSEC

DSEC(Number)

• Number is the angle in Degrees.
• DSEC(),returns the double-precision secant of the given angle

SEC can be used if the angle is in Radians.
The angle can be a single value or any complex array of values.
For example DSEC(1..100) can give an array of the results, which is the SECANT value for each of the elements in the array. The array could be of any values either '+' or '-' like 1..5@DSEC or (-5)..(-1)@DSEC.

## Description

• This function is used to obtain the Secant value of any Number in degrees.
• It is the reciprocal of COS function i.e, SEC(x) = 1 / COS(x).Here x is any Number.
• In a right angled triangle SEC(x) = Hypotenuse / Adjacent side.
• To obtain the value in Radians multiply with PI()/180 or use SEC function SEC(x)
• DSEC returns NaN if 'x' is not real

The following example shows how DSEC is applied to an array of numbers containing angles 1..10.

• Type =1..10@DSEC in Calci
• Type =1..10@DSEC or 1..10@DSEC in ZOS
Angles DSEC
1 1.000152328
2 1.000609544
3 1.001372346
4 1.002441898
5 1.003819838
6 1.00550828
7 1.007509825
8 1.009827573
9 1.012465126
10 1.015426612

## Examples

DSEC(Number)

• Number  is the angle in degrees.
• SEC(-x)=-SEC(x)
• Result shows DSEC(abc)= NAN
 DSEC(Degrees) Value DSEC(12) 1.0223405948650293 DSEC(81) 6.392453221499659 DSEC(-81) 6.392453221499659

## Related Videos

Trig Function Values in Degrees