C++ Math cos() Function

C++ Math cos() Function with tutorial for beginners and professionals with examples on isgreaterequal(), less(), islessequal(), islessgreater(), isunordered(), exp(), frexp(), ldexp(), log(), log10(), modf(), exp2(), expm1(), log1p(), log2(), logb(), scalbn(), scalbln() etc.

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C++ Math cos()

The function is used to find the cosine of an angle expressed in terms of radian.

Syntax

Consider a radian 'x'. Syntax would be:

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

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

Parameter

x: Value specified in terms of radian.

Return value

It returns the cosine of an angle in the range of[-1,1].

Example 1

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

#include 
#include
using namespace std;
int main()
{
    double degree=60;
    double d=60*3.14/180;
    cout<<"Cosine of an angle is : "<

Output:

Cosine of an angle is : 0.50046

In this example, cos() function calculates the cosine of an angle when the degree is equal to 60.

Example 2

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

#include 
#include
using namespace std;
int main()
{
  double degree= -90;
  double radian=degree*3.14/180;
  cout<<"Cosine of an angle is :"<

Output:

Cosine of an angle is :0.000796327

In this example, cos() function finds the cosine of an angle when the value is negative but it remains the same as cos(-x) =cos(x).

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