Raise a Chebyshev series to a power.
Returns the Chebyshev series cs raised to the power pow. The arguement cs is a sequence of coefficients ordered from low to high. i.e., [1,2,3] is the series T_0 + 2*T_1 + 3*T_2.
Parameters : | cs : array_like
pow : integer
maxpower : integer, optional
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Returns : | coef : ndarray
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