C# |数学。Cos()方法
数学。Cos() 是一个内置的数学类方法，它返回给定双值参数(指定角度)的余弦值。
语法:
public static double Cos(double num)
参数:
num: 是返回余弦的角度(以弧度为单位)，该参数的类型为系统。双。
返回值:返回类型为系统的数的值。双。如果 num 等于否定有限性、肯定有限性或 NaN ，则该方法返回 NaN 。
下面是说明数学的程序。Cos()方法。
程序 1: 展示数学的工作原理。Cos()方法。
// C# program to demonstrate working
// Math.Cos() method
using System;
class Geeks {
// Main Method
public static void Main(String []args)
{
double a = 70;
// converting value to radians
double b = (a * (Math.PI)) / 180;
// using method and displaying result
Console.WriteLine(Math.Cos(b));
a = 50;
// converting value to radians
b = (a * (Math.PI)) / 180;
// using method and displaying result
Console.WriteLine(Math.Cos(b));
a = 73;
// converting value to radians
b = (a * (Math.PI)) / 180;
// using method and displaying result
Console.WriteLine(Math.Cos(b));
a = 77;
// converting value to radians
b = (a * (Math.PI)) / 180;
// using method and displaying result
Console.WriteLine(Math.Cos(b));
}
}
Output:
0.342020143325669
0.642787609686539
0.292371704722737
0.224951054343865
程序 2: 展示数学的工作原理。Cos()方法时的自变量是 NaN 或无穷大。
// C# program to demonstrate working
// Math.Cos() method in infinity case
using System;
class Geeks {
// Main Method
public static void Main(String []args)
{
double positiveInfinity = Double.PositiveInfinity;
double negativeInfinity = Double.NegativeInfinity;
double nan = Double.NaN;
double result;
// Here argument is negative infinity,
// output will be NaN
result = Math.Cos(negativeInfinity);
Console.WriteLine(result);
// Here argument is positive infinity,
// output will also be NaN
result = Math.Cos(positiveInfinity);
Console.WriteLine(result);
// Here argument is NaN, output will be NaN
result = Math.Cos(nan);
Console.WriteLine(result);
}
}
Output:
NaN
NaN
NaN
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