sincosd

Compute the sine and cosine of the input angle at the same time.

Interface Definition

C interface:

void sincosdf(float x, float* sinx, float* cosx);

void sincosd(double x, double* sinx, double* cosx);

void sincosdl(long double x, long double* sinx, long double* cosx);

Parameters

Parameter	Type	Description	Input/Output
x	For sincosdf, x is of single-precision floating-point type. For sincosd, x is of double-precision floating-point type. For sincosdl, x is of long double-precision floating-point type.	Floating-point value representing an angle.	Input
sinx	For sincosdf, it is of single-precision floating-point pointer type. For sincosd, it is of double-precision floating-point pointer type. For sincosdl, it is of long double-precision floating-point pointer type.	Value to which sinx points. If the pointer is null, an undefined behavior occurs, and the interface does not verify the output pointer.	Output
cosx	For sincosdf, it is of single-precision floating-point pointer type. For sincosd, it is of double-precision floating-point pointer type. For sincosdl, it is of long double-precision floating-point pointer type.	Value to which cosx points. If the pointer is null, an undefined behavior occurs, and the interface does not verify the output pointer.	Output

Parameter

Type

Description

Input/Output

For sincosdf, x is of single-precision floating-point type.
For sincosd, x is of double-precision floating-point type.
For sincosdl, x is of long double-precision floating-point type.

Floating-point value representing an angle.

Input

sinx

For sincosdf, it is of single-precision floating-point pointer type.
For sincosd, it is of double-precision floating-point pointer type.
For sincosdl, it is of long double-precision floating-point pointer type.

Value to which sinx points.

If the pointer is null, an undefined behavior occurs, and the interface does not verify the output pointer.

Output

cosx

For sincosdf, it is of single-precision floating-point pointer type.
For sincosd, it is of double-precision floating-point pointer type.
For sincosdl, it is of long double-precision floating-point pointer type.

Value to which cosx points.

If the pointer is null, an undefined behavior occurs, and the interface does not verify the output pointer.

Output

Return Value

The sine sinx and cosine cosx of angle x are returned. sinx ∈ [-1, +1]; cosx ∈ [-1, +1]
If the input is +0, the sine is +0 and the cosine is +1.
If the input is -0, the sine is -0 and the cosine is +1.
If the input is ±∞, the sine and cosine are both NaN.
If the input is NaN, the sine and cosine are both NaN.

Dependencies

#include "km.h"

Examples

C interface:

    // typical usage
    double x1 = INFINITY, sinx1, cosx1;
    double x2 = 2.0, sinx2, cosx2;
    double x3 = -2.5, sinx3, cosx3;
    double x4 = NAN, sinx4, cosx4;
    double x5 = 0.0, sinx5, cosx5;
    sincosd(x1, &sinx1, &cosx1);
    sincosd(x2, &sinx2, &cosx2);
    sincosd(x3, &sinx3, &cosx3);
    sincosd(x4, &sinx4, &cosx4);
    sincosd(x5, &sinx5, &cosx5);
    // print result
    printf("/*\n");
    printf(" * sincosd(%.2f), sinval = %.6f cosval= %.6f\n", x1, sinx1, cosx1);
    printf(" * sincosd(%.2f), sinval = %.6f cosval= %.6f\n", x2, sinx2, cosx2);
    printf(" * sincosd(%.2f), sinval = %.6f cosval= %.6f\n", x3, sinx3, cosx3);
    printf(" * sincosd(%.2f), sinval = %.6f cosval= %.6f\n", x4, sinx4, cosx4);
    printf(" * sincosd(%.2f), sinval = %.6f cosval= %.6f\n", x5, sinx5, cosx5);
     /* 
     * sincosd(inf), sinval = nan cosval= nan
     * sincosd(2.00), sinval = 0.034899 cosval= 0.999391
     * sincosd(-2.50), sinval = -0.043619 cosval= 0.999048
     * sincosd(nan), sinval = nan cosval= nan
     * sincosd(0.00), sinval = 0.000000 cosval= 1.000000
 

Parent topic: Trigonometric Functions