# share

We can share typing at the same document at the same time

- point one
- point two

Mathematics

$\frac{\partial u}{\partial t} = \nabla^2 u$

\begin{bmatrix}
\cos\theta & -\sin\theta \\
\sin\theta & \cos\theta
\end{bmatrix}

The point of markdown is

1. simpler notation
1. don't use too many fancy formatting
3. can inter convert to other format easily

import numpy as np
import matplotlib.pyplot as plt

x = np.linspace(0, np.pi, 300)
plt.plot(x, np.cos(4*x))