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79aff2789de96c0e8728fb0d3b6b25f9d114c800
[musl]
/
src
/
complex
/
casin.c
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#include "libm.h"
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// FIXME
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/* asin(z) = -i log(i z + sqrt(1 - z*z)) */
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double complex casin(double complex z)
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{
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double complex w;
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double x, y;
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x = creal(z);
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y = cimag(z);
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w = cpack(1.0 - (x - y)*(x + y), -2.0*x*y);
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return clog(cpack(-y, x) + csqrt(w));
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}