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Input:
1/x^2 +1/y^2-1
Write:
`1/x^2 +1/y^2-1`
Compute:
$$\frac {1}{{x}^{2}}+\frac {1}{{y}^{2}} - 1$$
Output:
$$\frac {1}{{x}^{2}}+\frac {1}{{y}^{2}} - 1== -1+\frac{1}{x^2}+\frac{1}{y^2}$$
Result: $$-1+\frac{1}{x^2}+\frac{1}{y^2}$$
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