Java Math tan() 方法和示例

Java.lang.Math.tan()返回角度的三角正切。

• 如果参数是 NaN 或无穷大，则返回的结果是 NaN。
• 如果参数为零，则结果为零，其符号与参数相同。

  句法 ：

  public static double tan(double angle)
  Parameters :
  The function has one mandatory parameter angle which is in radians. 
  

  返回：
  该函数返回一个角度的三角正切。

  示例 1：展示Java.lang.Math.tan() 方法的工作原理。

  // Java program to demonstrate working
  // of java.lang.Math.tan() 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.tan(b));
    
          a = 45;
            
          // converting values to radians
          b = Math.toRadians(a);
    
          System.out.println(Math.tan(b));
    
          a = 60;
            
          // converting values to radians
          b = Math.toRadians(a);
    
          System.out.println(Math.tan(b));
    
          a = 0;
            
          // converting values to radians
          b = Math.toRadians(a);
    
          System.out.println(Math.tan(b));
      }
  }
  

  输出 ：

  0.5773502691896257
  0.9999999999999999
  1.7320508075688767
  0.0
  

  示例 2：展示当参数为 NAN 或无穷大时Java.lang.Math.tan() 方法的工作原理。

  // Java program to demonstrate working
  // of java.lang.Math.tan() method infinity case
  import java.lang.Math;
    
  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.tan(negativeInfinity);
          System.out.println(result);
    
          // Here argument is positive infinity, 
          // output will also be NaN
          result = Math.tan(positiveInfinity);
          System.out.println(result);
    
          // Here argument is NaN, output will be NaN
          result = Math.tan(nan);
          System.out.println(result);
      }
  }
  

  输出 ：

  NaN
  NaN
  NaN