Raise a polynomial to a power.
Returns the polynomial c raised to the power pow. The argument c is a sequence of coefficients ordered from low to high. i.e., [1,2,3] is the series 1 + 2*x + 3*x**2.
| Parameters : | c : array_like 
 pow : integer 
 maxpower : integer, optional 
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| Returns : | coef : ndarray 
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