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