_fcossin -- Calculate Cosine and Sine

Format

#include <builtin.h>
double _fcossin(double x, double *y);

Language Level: Extension
_fcossin calculates the cosine of x, and stores the sine of x in *y. This is faster than separately calculating the sine and cosine. Use _fcossin instead of _fsincos when you will be using the cosine first, and then the sine. This function causes the compiler to emit the FSINCOS 80387 instruction.

Because it is a built-in function and has no backing code in the library:

Return Value
_fcossin returns the cosine of x.

Example
This example calculates the cosine of x and stores it in z, and stores the sine of x in *y.

#include <builtin.h>
#include <stdio.h>
int main(void)
{
   double x, y, z;
   printf("Enter x:\n");
   scanf("%lf", &x);
   z = _fcossin(x, &y);
   printf("The cosine of %lf is %lf.\n", x, z);
   printf("The sine of %lf is %lf.\n", x, y);
   return 0;
   /**********************************************
      Assuming you enter: 1.0
      The output should be:
      The cosine of 1.000000 is 0.540302.
      The sine of 1.000000 is 0.841471.
   **********************************************/
}



acos -- Calculate Arccosine
asin -- Calculate Arcsine
cos -- Calculate Cosine
cosh -- Calculate Hyperbolic Cosine
_facos -- Calculate Arccosine
_fasin -- Calculate Arcsine
_fcos -- Calculate Cosine
sin -- Calculate Sine
sinh -- Calculate Hyperbolic Sine
_fsin -- Calculate Sine
_fsincos -- Calculate Sine and Cosine
<builtin.h>