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Input:
ring(1,2)
Write:
`ring(1,2)`
Compute:
$$ring(1,2)$$
Output:
$$ring(1,2)== abs(-4+{x}^{2}+{y}^{2})\ abs(-1+{x}^{2}+{y}^{2})+(-4+{x}^{2}+{y}^{2})\ (-1+{x}^{2}+{y}^{2})$$
Result: $$abs(-4+{x}^{2}+{y}^{2})\ abs(-1+{x}^{2}+{y}^{2})+(-4+{x}^{2}+{y}^{2})\ (-1+{x}^{2}+{y}^{2})$$
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