double acos (double d)	{ return Math.acos(d); }
double asin (double d)	{ return Math.asin(d); }
double cos (double d)	{ return Math.cos(d); }
double sin (double d)	{ return Math.sin(d); }
double croot (double d)	{ return Math.pow(d, 1/3); }
double cube (double x)	{ return x * x * x; }

Var compose (Var f, Var g, double x)
{
	Func ff = f;
	Func fg = g;
	return ff(fg(x));
}

void button1_onClick (Widget widget)
{
	Array arr1 = [ sin, cos, cube ];
	Array arr2 = [ asin, acos, croot ];
	
	str s;
	for (int i = 1; i <= 3; i++)
	{
		s << compose(arr1.get(i), arr2.get(i), 0.5) << str.newline;	
	}
	label1.setText(s);
}