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Input:
definition(erfi(x))
Write:
`definition(erfi(x))`
Compute:
$$definition:\\ \ erfi(x)$$
Output:
$$definition:\\ \ erfi(x)== 2\ \frac{1}{\sqrt{\pi }}\ (\sum _{k=0} ^ {oo} (\frac {\frac{1}{(k)!}}{1+2\ k})\ ({x}^{1+2\ k}))$$
Result:
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