CalcArcCos
CalcArcCos
CalcArcCos[ x ] calculates the inverse cosine of a number as an angle, in radians or degrees.
Usages
CalcArcCos[ x ]
CalcArcCos[ x ] calculates the inverse cosine of x as a decimal number of radians. x must be a decimal number with a fractional part, such as 0.5 (see the warning below).
| Example | in | out |
|---|---|---|
| The angle in radians. | CalcArcCos[ 0.5 ] |
1.047197551197 |
| Each element of a list. | CalcArcCos[ {0.5, 0.25}, Variant=>'deg' ] |
{60, 75.52248781407} |
CalcArcCos[ x, Variant=>'deg' ]
With the option Variant=>'deg', the angle is given in degrees.
| Example | in | out |
|---|---|---|
| The angle in degrees. | CalcArcCos[ 0.5, Variant=>'deg' ] |
60 |
Options
Variant
'deg' to get the angle in degrees. Default: radians.
| Syntax | Example | out |
|---|---|---|
CalcArcCos[ x, Variant=>'deg' ] |
CalcArcCos[ 0.5, Variant=>'deg' ] |
60 |
Details
- Lists: each element is calculated.
- Variables:
CalcArcCos[ x ]with a variablexis left unevaluated.
Warning
CalcArcCos only calculates decimal numbers with a fractional part. CalcArcCos[ 1 ] and CalcArcCos[ 1.0 ] (which counts as the whole number 1) are left unevaluated, also with Variant=>'deg'. Use Numerical to calculate them: Numerical[ CalcArcCos[1] ].
See also: Numerical, CalcSin, CalcCos, Math functions