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Input:
oval(2,1)
Write:
`oval(2,1)`
Compute:
$$oval(2,1)$$
Output:
$$oval(2,1)== -1+0.25\ {x}^{2}+{y}^{2}$$
Result: $$-1+0.25\ {x}^{2}+{y}^{2}$$
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