带示例的 Java 数学 cos()方法
原文:https://www . geesforgeks . org/Java-math-cos-method-examples/
java.lang.Math.cos() 返回一个角度的三角余弦。如果参数是 NaN 或无穷大，则返回的结果是 NaN。返回值将在范围 [-1，1]内。
语法:
public static double cos(double angle)
Parameters:
The function has one mandatory parameter angle which is in radians.
返回: 函数返回一个角度的三角余弦值。
例 1 : 展示 java.lang.Math.cos()方法的工作原理。
// Java program to demonstrate working
// of java.lang.Math.cos() method
import java.lang.Math;
class Gfg {
// driver code
public static void main(String args[])
{
double a = 30;
// converting values to radians
double b = Math.toRadians(a);
System.out.println(Math.cos(b));
a = 45;
// converting values to radians
b = Math.toRadians(a);
System.out.println(Math.cos(b));
a = 60;
// converting values to radians
b = Math.toRadians(a);
System.out.println(Math.cos(b));
a = 0;
// converting values to radians
b = Math.toRadians(a);
System.out.println(Math.cos(b));
}
}
Output:
0.8660254037844387
0.7071067811865476
0.5000000000000001
1.0
例 2 : 展示当自变量为 NAN 或无穷大时，java.lang.Math.cos()方法的工作情况。
// Java program to demonstrate working
// of java.lang.Math.cos() method infinity case
import java.lang.Math; // importing java.lang package
public class GFG {
public static void main(String[] args)
{
double positiveInfinity =
Double.POSITIVE_INFINITY;
double negativeInfinity =
Double.NEGATIVE_INFINITY;
double nan = Double.NaN;
double result;
// Here argument is negative infinity,
// output will be NaN
result = Math.cos(negativeInfinity);
System.out.println(result);
// Here argument is positive infinity,
// output will also be NaN
result = Math.cos(positiveInfinity);
System.out.println(result);
// Here argument is NaN, output will be NaN
result = Math.cos(nan);
System.out.println(result);
}
}
Output:
NaN
NaN
NaN
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