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__sincospi(3) [mojave man page]

__SINCOSPI(3)						   BSD Library Functions Manual 					     __SINCOSPI(3)

__sincospi -- sine-pi and cosine-pi function SYNOPSIS
#include <math.h> float __sincospif(float x, float *sinp, float *cosp); double __sincospi(double x, double *sinp, double *cosp); DESCRIPTION
The __sincospi() function computes the sine and cosine of pi times x (measured in radians) and stores the sine in the memory pointed to by sinp and the cosine in the memory pointed to by cosp. SPECIAL VALUES
__sincospi() produces the same results as separate calls to __sinpi() and __cospi(). SEE ALSO
__cospi(3), __sinpi(3), __tanpi(3), math(3) BSD
December 15, 2012 BSD

Check Out this Related Man Page

__COSPI(3)						   BSD Library Functions Manual 						__COSPI(3)

__cospi -- cosine-pi function SYNOPSIS
#include <math.h> float __cospif(float x); double __cospi(double x); DESCRIPTION
The __cospi() function returns the cosine of pi times x (measured in radians). This can be computed more accurately than cos(M_PI * x), because it can implicitly use as many bits of pi as are necessary to deliver a well-rounded result, instead of the 53-bits to which M_PI is limited. For large x it may also be more efficient, as the argument reduction involved is significantly simpler. This function may be especially useful for working with degrees; whereas cos(M_PI * x / 180.0) cannot produce exact results for angles that naively "should" be exact, like 90 degrees, __cospi(x / 180.0) can be computed exactly. SPECIAL VALUES
__cospi(-x) is the same as __cospi(x) for any finite x. __cospi(n) returns +1 for any even integer n. __cospi(n) returns -1 for any odd integer n. __cospi(n + 0.5) returns +0 for any integer n. __cospi(+-infinity) raises the invalid floating-point exception and returns NaN. VECTOR OPERATIONS
If you need to apply the __cospi() function to SIMD vectors or arrays, using the following functions provided by the Accelerate.framework may be useful: #include <Accelerate/Accelerate.h> vFloat vcospif(vFloat x); void vvcospif(float *y, float *x, const int n); void vvcospi(double *y, double *x, const int n); SEE ALSO
__sinpi(3), __tanpi(3), __sincospi(3), math(3) BSD
December 15, 2012 BSD
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