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HP-UX Reference > Ccacos(3M)HP Integrity Server OnlyHP-UX 11i Version 3: February 2007 |
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NAMEcacos(), cacosf(), cacosl(), cacosw(), cacosq() — complex arccosine functions SYNOPSIS#include <complex.h> double complex cacos(double complex z); float complex cacosf(float complex z); long double complex cacosl(long double complex z); extended complex cacosw(extended complex z); quad complex cacosq(quad complex z); DESCRIPTIONThese functions are available only for Integrity servers. cacos() returns the complex arccosine of z, in the range of a strip mathematically unbounded along the imaginary axis and in the interval [0,Pi] along the real axis. Branch cuts are outside the interval [-1,+1] along the real axis. cacosf() is a float complex version of cacos(); it takes a float complex argument and returns a float complex result. cacosl() is a long double complex cacos(); it takes a long double complex argument and returns a long double complex result. cacosw() is an extended complex version of cacos(); it takes an extended complex argument and returns an extended complex result. cacosq() is equivalent to cacosl() on HP-UX systems. USAGETo use these functions, compile with the default -Ae option. To use cacosw() or cacosq(), compile with the -fpwidetypes option. Make sure your program includes <complex.h>, and link in the math library by specifying -lm on the compiler or linker command line. RETURN VALUEcacos(conj(z)) = conj(cacos(z)) cacos(±0+i0) returns Pi/2-i0. cacos(±0+iNaN) returns Pi/2+iNaN. cacos(x+iInf) returns Pi/2-iInf, for finite x. cacos(x+iNaN) returns NaN+iNaN and optionally raises the invalid floating-point exception, for nonzero finite x. cacos(-Inf+iy) returns Pi-iInf, for positive-signed finite y. cacos(+Inf+iy) returns +0-iInf, for positive-signed finite y. cacos(-Inf+iInf) returns 3Pi/4-iInf. cacos(+Inf+iInf) returns Pi/4-iInf. cacos(±Inf+iNaN) returns NaN±iInf (where the sign of the imaginary part of the result is unspecified). cacos(NaN+iy) returns NaN+iNaN and optionally raises the invalid floating-point exception, for finite y. cacos(NaN+iInf) returns NaN-iInf. cacos(NaN+iNaN) returns NaN+iNaN. |
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