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