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numpy.poly1d.integ
method
poly1d.integ(m=1, k=0)[source]- 
    
Return an antiderivative (indefinite integral) of this polynomial.
Refer to
polyintfor full documentation.See also
polyint- 
       
equivalent function
 
 
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 https://numpy.org/doc/1.20/reference/generated/numpy.poly1d.integ.html