This function is defined in <cmath> header file.
[Mathematics] tan x = tan(x) [In C++ Programming]
tan() prototype (As of C++ 11 standard)
double tan(double x); float tan(float x); long double tan(long double x); double tan (T x); // For integral type
tan() Parameters
The tan() function takes a single mandatory argument in radians (can be positive, negative, or 0).
tan() Return value
The tan() function returns the value in the range of [-∞, ∞].
Example 1: How tan() works in C++?
#include <iostream>
#include <cmath>
using namespace std;
int main()
{
long double x = 0.99999, result;
result = tan(x);
cout << "tan(x) = " << result << endl;
double xDegrees = 60.0;
// converting degree to radians and using tan() fucntion
result = tan(xDegrees*3.14159/180);
cout << "tan(x) = " << result << endl;
return 0;
}
When you run the program, the output will be:
tan(x) = 1.55737 tan(x) = 1.73205
Example 2: tan() function with integral type
#include <iostream>
#include <cmath>
using namespace std;
int main()
{
long int x = 6;
double result;
result = tan(x);
cout << "tan(x) = " << result;
return 0;
}
When you run the program, the output will be:
tan(x) = -0.291006
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