Java StrictMath cos()方法及实例

java.lang.StrictMath.cos() 是Java中的一个内置方法，用于返回给定角度的余弦值。当给定参数为NaN或无穷大时，该方法返回NaN。

语法

public static double cos(double num)

参数： 该方法接受一个双倍类型的参数num，指的是要返回其余弦值的弧度角。
返回值： 该方法返回参数的余弦值。
示例 :

Input: num = 62.0Output: 0.6735071623235862Input: num = 64.6Output: -0.19607204956188945

下面的程序说明了java.lang.StrictMath.cos()方法：
程序1

// Java program to illustrate the// java.lang.StrictMath.cos()import java.lang.*; public class Geeks { public static void main(String[] args) {     double num1 = 0.0, num2= 1.0 , num3= 64.6;         /* Returns trigonometric cosine of specified    angle in radian*/    double cosValue = StrictMath.cos(num1);    System.out.println("The cosine of "+                           num1+" = " + cosValue);     cosValue = StrictMath.cos(num2);    System.out.println("The cosine of "+                           num2+" = " + cosValue);     cosValue = StrictMath.cos(num3);    System.out.println("The cosine of "+                           num3+" = " + cosValue);}}

输出

The cosine of 0.0 = 1.0The cosine of 1.0 = 0.5403023058681398The cosine of 64.6 = -0.19607204956188945

程序2

// Java program to illustrate the// java.lang.StrictMath.cos()import java.lang.*; public class Geeks { public static void main(String[] args) {     double num1= -62.0, num2 = 1.0;        double num3= (45*(Math.PI))/180;         /* It returns the  cosine of specified    angle in radian*/    double cosValue = StrictMath.cos(num1);    System.out.println("The cosine of "+                           num1+" = " + cosValue);    cosValue = StrictMath.cos(num2);    System.out.println("The cosine of "+                           num2+" = " + cosValue);    cosValue = StrictMath.cos(num3);    System.out.println("The cosine of "+                           num3+" = " + cosValue);}}

输出

The cosine of -62.0 = 0.6735071623235862The cosine of 1.0 = 0.5403023058681398The cosine of 0.7853981633974483 = 0.7071067811865476