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

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double jv_atan(x)
double x;
{
	double jv_atan2();
	return(jv_atan2(x,1.));
}

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