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Function Details : cos

doublecos(double x) ;

Return Type : double

Double-precision floating point (±1.7E±308, ~15 decimal digits)
Read about return values of cos function .

1st Parameter Type : double

Double-precision floating point (±1.7E±308, ~15 decimal digits)

1st Parameter

The angle in radians for which the cosine value is to be computed

Read more about parameters of cos in parameters section
The cosfunction in C language Calculates the cosine of the specified angle in radians.
The cos function computes the cosine of an angle of x radians. The cosine is a periodic function with a period of 2π. For any value of x, the cosine will be between -1 and 1, inclusive. This function is commonly used in various mathematical and scientific applications, particularly those involving trigonometry or periodic phenomena.
The cosfunction takes 1 parameter:
  • •
    double `x`: The angle in radians for which the cosine value is to be computed
Computes the cosine of the given angle `x`, expressed in radians, and returns the result as a `double`.
The cos function return value :
  • Returns the cosine of x
  • The return value is in the range [-1, 1]
#include <stdio.h>
#include <math.h>
#define PI 3.14159265358979323846
int main() {
double angles[] = {0, PI/6, PI/4, PI/3, PI/2, PI};
int n = sizeof(angles) / sizeof(angles[0]);
for (int i = 0; i < n; i++) {
printf("cos(%.4f) = %.4f\n", angles[i], cos(angles[i]));
}
return 0;
}
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Output

This example demonstrates the basic usage of the `cos` function for various common angles in radians. It shows the cosine values for 0°, 30°, 45°, 60°, 90°, and 180°.