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Java – Find Arc Cosine – acos() Method – Examples & Explanation

java.lang.Math.acos() method is used to find the arc cosine of a double value in Java for the given input (x – parameter).
The returned angle is in the range 0.0 through PI (22/7).
The computed result must be within 1 ulp of the exact result. Results must be semi-monotonic.

acos() method exists in Math class of java.lang package.
Since: JDK1.0

 

Declaration of acos() Method

The declaration of acos() method is:

 

Syntax of acos() Method

The syntax of acos() method in Java is:

Example

Output:

1.0471975511965979

Example
By importing java.lang package the syntax of acos() method can be used as:

Output:

1.0471975511965979

 

Parameters of acos() Method in Java

x – Where x is any valid double input value. This parameter is required.

 

Error Handling

If the x parameter is not a number acos() method returns an error.
If there is no argument (x – input value) passes to the method, the compiler will produce an error.
Example

Output:
Error

 

Return Value of acos() Method in Java

acos() method returns the arc cosine of a double value for the given input (x – parameter).

 

Java acos() Method Example 1


Output:

arc cosine of a Negative Value: 2.0943951023931957
arc cosine of a Positive Value: 1.0471975511965979
arc cosine of Zero: 1.5707963267948966

 

Java acos() Method Example 2


Output:

NaN
1.5707963267948966
NaN
NaN
1.5707963267520295
NaN
1.5707963267948966
NaN
NaN

NOte : Those values which are not in the range of (0.0 through Pi) will return a NaN value.

 

Special Cases of acos() Method in Java

If the argument is NaN or its absolute value is greater than 1, then the result is NaN.
Example

Output:

NaN

 

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