Math.acos()
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); //1.5707963267948966All Math functions
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