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C++ Math tan()

The function finds the tangent of an angle specified in terms of radian.

Syntax

Consider a radian 'x'. Syntax would be:

float tan(float x);
double tan(double x);
long double tan(long double x);
double tan(integral x);

Note: If the value passed is an integral type, then it is cast to double.

Parameter

x: The value given in radian.

Return value

It returns the tangent of an angle given in radian.

Example 1

Let's see the simple example when the value of x is positive.

#include <iostream>
#include<math.h>
using namespace std;
int main()
{
   float degree=10;
   float radian=degree*3.14/180;
   cout<<"Tangent of an angle is : "<<tan(radian);
   return 0;
}

Output:

Tangent of an angle is : 0.176236

In this example, tan() function calculates the tangent of an angle when the value of degree is equal to 10.

Example 2

Let's see the simple example when the value of degree is negative.

#include <iostream>
#include<math.h>
using namespace std;
int main()
{
  float degree= -60;
  float radian=degree*3.14/180;
  cout<<"Tangent of an angle is :"<<tan(radian);
  return 0;
}

Output: