# Manuals/calci/DTAN

DTAN(x)

• where x is the angle in Degrees
• by default Calci use Radians as angle

TAN can be used if the angle is in Radians.

## Description

• This function is used to obtain the Tangent value of 'x' in Degrees.
• It is the reciprocal of COTAN function i.e.,Tan(x) = 1 / COTAN(x) or SIN(x) / COS(x).
• In a right angled triangle Tan(x) = Opposite side / Adjacent side.
• To obtain the value in Radians multiply with PI()/180 or use Tan function TAN(x)
• DTAN returns NaN if 'x' is not real

The angle can be a single value or any complex array of values.

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

• Type =1..10@DTAN in Calci
• Type =1..10@DTAN or 1..10@DTAN in ZOS
Number DTAN
1 0.017455065
2 0.034920769
3 0.052407779
4 0.069926812
5 0.087488664
6 0.105104235
7 0.122784561
8 0.140540835
9 0.15838444
10 0.176326981

## Examples

DTAN(x)

• x   is the angle in radians.
• TAN(-x)=-TAN(x)
• Result shows TAN(abc)= NAN
 DTAN(Radian) Value DTAN (0) 0 DTAN (1) 0.017455065 DTAN (-45) -1