ftp.nice.ch/pub/next/developer/hardware/m68k/SoftwareMathCoprocFor68040.2.0.N.sa.tar.gz#/libjv/acos.c

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static double pid2= 1.5707963267948966192;

double jv_acos(x)
double x;
{
	double jv_asin();
	return(pid2-jv_asin(x));
}

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.