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acos() 方法返回指定 double 值的反余弦值。
double acos(double d)
d - double 数据类型。
方法返回指定 double 值的反余弦值。
public class Main { public static void main(String args[]) { double degrees = 45.0; double radians = Math.toRadians(degrees); System.out.format("The value of pi is %.4f%n", Math.PI); System.out.format("The arccosine of %.4f is %.4f degrees %n", Math.cos(radians), Math.toDegrees(Math.acos(Math.cos(radians)))); } }
上面示例编译运行结果如下
The value of pi is 3.1416
The arccosine of 0.7071 is 45.0000 degrees