The acos() function, also called the arc cosine function, returns the inverse cosine of a number. To be more specific, it returns the inverse cosine of a number in radians.
The image below shows the mathematical representation of the acos() function.
The
scala.math._header file is required for this function.
To convert degrees to radians, use the formula below:
radians = degrees * ( Pi / 180 )
Double acos(Double number)
This function requires a number as a parameter. The parameter must be a double value between -1 and 1.
acos() returns the inverse cosine of the number (in radians) that is sent as a parameter. The return value lies in the interval [0, pi] radians.
If the parameter value is an error value, i.e., greater than one or less than one or infinity or NaN, then acos() returns NaN.
import scala.math._object Main extends App {//positive number in radiansprintln(s"The value of acos(0.5) = ${acos(0.5)} Radians");// negative number in radiansprintln(s"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 = 3.14159265println(s"The value of acos(0.5) = ${acos(0.5) * (180 / Pi)} Degrees");//error outputsprintln(s"The value of acos(Double.PositiveInfinity) = ${acos(Double.PositiveInfinity)}");println(s"The value of acos(Double.NegativeInfinity) = ${acos(Double.NegativeInfinity)}");println(s"The value of acos(Double.NaN) = ${acos(Double.NaN)}");println(s"The value of acos(2) = ${acos(2)}");println(s"The value of acos(-2) = ${acos(-2)}");}