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Input:
definition(si(x))
Write:
`definition(si(x))`
Compute:
$$definition:\\ \ si(x)$$
Output:
$$definition:\\ \ si(x)== \sum _{k=0}^\infty (\frac {\frac {{(-1)}^{k}}{(1+2\ k)!}}{1+2\ k})\ ({x}^{1+2\ k})$$ Result:
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