[NumCS] Add numpy, scipy and sympy quick overview

semester3/numcs/parts/06_python/02_scipy.tex

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+\subsection{Scipy}
+Scipy is a library that, according to its website, provides ``Fundamental algorithms for scientific computing in Python''.
+In this course it is primarily used for cases where Numpy either does not have an implementation or SciPy's implementation is faster.
+
+Scipy needs Numpy arrays as inputs in most cases, thus not requiring any additional syntax.
+
+You can find the scipy reference docs \hlhref{https://docs.scipy.org/doc/scipy/reference/index.html}{here}