Input: sum(x^k,k,1,5)
Write: `sum(x^k,k,1,5)`
Output: $$\sum _{k=1} ^ {5} {x}^{k}== \frac {((-x)+{x}^{6})}{-1+x}$$ Result: $$\frac {((-x)+{x}^{6})}{-1+x}$$
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