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Showing content from https://cplusplus.com/reference/cmath/sin/ below:

function

sin

     double sin  (double x);      float sinf (float x);long double sinl (long double x);

     double sin (double x);      float sin (float x);long double sin (long double x);

     double sin (double x);      float sin (float x);long double sin (long double x);     double sin (T x);           // additional overloads for integral types

Compute sine

Returns the sine of an angle of x radians.

Header

<tgmath.h>

provides a type-generic macro version of this function.

Parameters

x: Value representing an angle expressed in radians.
One radian is equivalent to 180/PI degrees.

Return Value Sine of x radians.

Example

/* sin example */
#include <stdio.h>      /* printf */
#include <math.h>       /* sin */

#define PI 3.14159265

int main ()
{
  double param, result;
  param = 30.0;
  result = sin (param*PI/180);
  printf ("The sine of %f degrees is %f.\n", param, result );
  return 0;
}

Output:

The sine of 30.000000 degrees is 0.500000.