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27c356364c8c6ffe438767352195e791ed03a23f
[musl]
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cacos.c
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#include "libm.h"
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// FIXME: Hull et al. "Implementing the complex arcsine and arccosine functions using exception handling" 1997
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/* acos(z) = pi/2 - asin(z) */
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double complex cacos(double complex z)
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{
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z = casin(z);
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return CMPLX(M_PI_2 - creal(z), -cimag(z));
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}