#include "stdafx.h"
#include "defs.h"

void
eval_arcsinh(void)
{
	push(cadr(p1));
	eval();
	arcsinh();
}

void
arcsinh(void)
{
	double d;
	save();
	p1 = pop();
	if (car(p1) == symbol(SINH)) {
		push(cadr(p1));
		restore();
		return;
	}
	if (isdouble(p1)) {
		d = p1->u.d;
		d = log(d + sqrt(d * d + 1.0));
		push_double(d);
		restore();
		return;
	}
	if (iszero(p1)) {
		push(zero);
		restore();
		return;
	}
	push_symbol(ARCSINH);
	push(p1);
	list(2);
	restore();
}