EN
C# / .NET - Math.Cos() method example
0 points
The Math.Cos() function returns the cosine of the specified angle in radians in the range -1 to +1.
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using System;2
3
class Program4
{5
static void Main(string[] args)6
{7
Console.WriteLine( Math.Cos( 0 ) ); // 1 <- 0 degrees8
Console.WriteLine( Math.Cos( 1.5707963267948966 ) ); // ~0 <- ~90 degrees == PI / 29
Console.WriteLine( Math.Cos( 3.1415926535897932 ) ); // ~-1 <- ~180 degrees == PI10
Console.WriteLine( Math.Cos( 4.71238898038469 ) ); // ~0 <- ~270 degrees == -PI * (3 / 2)11
Console.WriteLine( Math.Cos( 6.2831853071795850 ) ); // ~1 <- ~360 degrees == PI * 212
13
Console.WriteLine( Math.Cos( -1.5707963267948966) ); // ~0 <- ~-90 degrees == -PI / 214
}15
}Note:
6.123233995736766e-17,-1.8369701987210297e-16and6.123233995736766e-17should be equal to0but they are not because of computation precision error.
| Syntax |
xxxxxxxxxx1 namespace System2 {3 public final class Math4 {5 // ...6 public static double Cos(double number) { ... }7 // ...8 }9 } |
| Parameters | number - double value in radians (primitive value). |
| Result |
returns a numeric value between |
| Description | Cos is a static method that takes only one parameter and returns an approximation of cos(x) mathematical function result. |
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using System;2
3
class Program4
{5
static void Main(string[] args)6
{7
double x1 = 0.0; // beginning of calculation in radians8
double x2 = Math.PI / 2; // ending of calculation radians9
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double dx = Math.PI / 9; // calculation step in degrees11
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for (double rad = x1; rad <= x2; rad += dx)13
{14
double y = Math.Cos(rad);15
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Console.WriteLine("cos(" + rad + " rad) = " + y);17
}18
}19
}Output:
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cos(0.0 rad) = 12
cos(0.3490658503988659 rad) = 0.93969262078590843
cos(0.6981317007977318 rad) = 0.7660444431189784
cos(1.0471975511965976 rad) = 0.50000000000000015
cos(1.3962634015954636 rad) = 0.17364817766693041xxxxxxxxxx1
using System;2
3
class Program4
{5
static double calculateCos(double deg)6
{7
double rad = (Math.PI / 180) * deg;8
9
return Math.Cos(rad);10
}11
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static void Main(string[] args)13
{14
double x1 = 0.0; // beginning of calculation in degrees15
double x2 = 90.0; // ending of calculation degrees16
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double dx = 15.0; // calculation step in degrees18
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for (double deg = x1; deg <= x2; deg += dx)20
{21
double y = calculateCos(deg);22
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Console.WriteLine("cos(" + deg + " deg) = " + y);24
}25
}26
}Output:
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cos(0.0 deg) = 12
cos(15.0 deg) = 0.96592582628906833
cos(30.0 deg) = 0.86602540378443874
cos(45.0 deg) = 0.70710678118654765
cos(60.0 deg) = 0.50000000000000016
cos(75.0 deg) = 0.258819045102520747
cos(90.0 deg) = 6.123233995736766E-17xxxxxxxxxx1
using System;2
using System.Text;3
4
class Program5
{6
static void Main(string[] args)7
{8
double x1 = 0.0; // beginning of cosine chart9
double x2 = 3 * 3.14; // end of cosine chart10
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double dx = 3.14 / 4.0; // x axis step12
double dy = 1.0 / 5.0; // y axis step13
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for (double rad = x1; rad < x2; rad += dx)15
{16
double y1 = 0.0;17
double y2 = Math.Cos(rad) + 1;18
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StringBuilder line = new StringBuilder();20
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for (double y = y1; y < y2; y += dy)22
{23
line.Append(" ");24
}25
Console.WriteLine(line.Append("+"));26
}27
}28
}Output:
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+2
+3
+4
+5
+6
+7
+8
+9
+10
+11
+12
+