The acos()
function, also called the arc cosine function, returns the inverse cosine of a number. To be more specific, acos()
returns the inverse cosine of a number in radians.
The image below shows the mathematical representation of the acos()
function.
Note:
std.math
is required for this function.
To convert radians to degrees, use the following formula:
degrees = radians * ( 180.0 / PI )
acos(number)
//number can be real, float, or double.
This function requires a number as a parameter. The parameter must be a value between -1
and 1
.
-1 <= parameter <= 1.
If the value is outside -1 <= parameter <= 1, then acos()
returns -NaN
.
acos()
returns the inverse cosine of a number (in radians) that is sent as a parameter. The return value lies in the interval [0, pi]
radians.
The following code shows how to use the acos()
function in D.
import core.stdc.stdio; import std.stdio; //header required for function import std.math; int main() { //positive number in radians writeln("The value of acos(0.5): ",acos(0.5) ," Radians"); // negative number in radians writeln("The value of acos(-0.5): ",acos(-0.5) ," Radians"); //applying acos() and then converting the result in radians to degrees // radians = 0.5 // PI = 3.14159265 double result=acos(0.5) * (180.0 / PI); writeln("The value of acos(0.5): ",result," Degrees"); //error output writeln("The value of acos(1.5): ",acos(1.5)); writeln("The value of acos(-1.5): ",acos(-1.5)); return 0; }
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