double sin (double v)	{ return Math.sin(v); }
double asin (double v)	{ return Math.asin(v); }
Var compose (Func f, Func g, double d)	{ return f(g(d)); }

void button1_onClick (Widget widget)
{
	double d = compose(sin, asin, 0.5);
	label1.setText(d.toString(9));
}