The Lowest Few Functions

$\displaystyle j_0(x)$	$\displaystyle =$	$\displaystyle \frac{\sin(x)}{x}$	(13.20)
$\displaystyle j_1(x)$	$\displaystyle =$	$\displaystyle \frac{\sin(x)}{x^2} - \frac{\cos(x)}{x}$	(13.21)
	$\displaystyle \vdots$
$\displaystyle n_0(x)$	$\displaystyle =$	$\displaystyle - \frac{\cos(x)}{x}$	(13.22)
$\displaystyle n_1(x)$	$\displaystyle =$	$\displaystyle - \frac{\cos(x)}{x^2} - \frac{\sin(x)}{x}$	(13.23)
	$\displaystyle \vdots$