Math.acos()

Math.acos() returns the arc cosine value.
Syntax

Math.acos(input)

Here are some examples.

System.out.println(Math.acos(2)); 	//NaN
System.out.println(Math.acos(1.01));	//NaN
System.out.println(Math.acos(1)); 	// 0.0
System.out.println(Math.acos(-1));	//3.141592653589793
System.out.println(Math.acos(0)); 	//1.5707963267948966
System.out.println(Math.PI/2);     //1.5707963267948966

All Math functions

cos() tan() roRadians() roDegrees() log10() floor() Java - Tutorials

Java

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