C++ Program to Illustrate Trigonometric Functions

This C++ program illustrates the use of trigonometric functions. The trigonometric functions are declared in ‘math.h’ or ‘cmath’ header which is included in this program. The angles in radians are passed as parameters to these functions.

Here is the source code of the C++ program illustrates the use of trigonometric functions. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C++ Program to Illustrate Trigonometric functions

```
 */
```
```
#include <iostream>
```
```
#include <iomanip>
```
```
#include <cmath>
```
```
const double PI = 3.14159265;
```
```
 
```
```
int main()
```
```
{
```
```
    double degrees, radians;
```
```
 
```

    std::cout << "Enter angle in degrees ";

```
    std::cin >> degrees;
```

    // Trigonometric functions accept angles in radians

```
    radians = degrees * PI / 180.0;
```

    std::cout << "Value of trigonometric ratios " << std::endl;

    std::cout << "cos(radians) = " << std::setprecision(3)

              << cos(radians) << std::endl;

    std::cout << "sin(radians) = " << std::setprecision(3)

              << sin(radians) << std::endl;

    std::cout << "tan(radians) = " << std::setprecision(3)

              << tan(radians) << std::endl;

```
    return 0;
```
```
}
```

$ a.out
Enter angle in degrees 30
Value of trigonometric ratios
cos(radians) = 0.866
sin(radians) = 0.5
tan(radians) = 0.577

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