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Input:
polygamma(n,x)
Write:
`polygamma(n,x)`
Compute:
$$definition:\\ \ \psi ^{(n)}(x)$$
Output:
$$definition:\\ \ \psi ^{(n)}(x)== \frac{d^{{x}}\psi (n)}{dn^{{x}}}$$
Result: $$\frac{d^{{x}}\psi (n)}{dn^{{x}}}$$
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