The 2D Wave Equation on a Square;

Homogeneous Neumann Boundary Conditions

$1$	$cos(t)\; cos(x)$	$cos(2t)\; cos(2x)$	$cos(3t)\; cos(3x)$
$cos(t)\; cos(y)$	$cos(21/2t)\; cos(x)\; cos(y)$	$cos(51/2t)\; cos(2x)\; cos(y)$	$cos(101/2t)\; cos(3x)\; cos(y)$
$cos(2\; t)\; cos(2y)$	$cos(51/2t)\; cos(x)\; cos(2y)$	$cos(81/2t)\; cos(2x)\; cos(2y)$	$cos(131/2t)\; cos(3x)\; cos(2y)$
$cos(3\; t)\; cos(3y)$	$cos(101/2t)\; cos(x)\; cos(3y)$	$cos(131/2t)\; cos(2x)\; cos(3y)$	$cos(181/2t)\; cos(3x)\; cos(3y)$

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