Section: complex math routines (3)
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csqrt, csqrtf, csqrtl - complex square root
double complex csqrt(double complex z);
float complex csqrtf(float complex z);
long double complex csqrtl(long double complex z);
Link with -lm.
Calculate the square root of a given complex number,
with nonnegative real part, and
with a branch cut along the negative real axis.
(That means that csqrt(-1+eps*I) will be close to I while
csqrt(-1-eps*I) will be close to -I, if eps is a small positive
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linux.jgfs.net manual pages