java.lang.Math.tan()返回角度的三角正切。

如果参数为NaN或无穷大，则返回的结果为NaN。

如果自变量为零，则结果为零，其符号与自变量相同。

用法:public static double tan(double angle)

Parameters:

The function has one mandatory parameter angle which is in radians.

返回值：

该函数返回角度的三角正切。

范例1：展示java.lang.Math.tan()方法的用法。

// 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

范例2：在参数为NAN或无穷大时显示java.lang.Math.tan()方法的用法。

// 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