Thanks for sharing. One thing I would suggest, to avoid mixing SymPy and
NumPy functions, is to only import sympy and numpy as
import sympy as sym
import numpy as np
and then use sym.cos or np.cos. Otherwise, one cell has SymPy cos and
another has NumPy cos, and it can be very confusing, since
As title, sympy package had been introduced in these lectures, especially
for Multiple-variable functions. If interested, welcome to visit the site:
https://github.com/cchuang2009/2016-1/tree/master/calculus
cch
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