ss="highlight"><pre><span></span><span class="kn">import</span><span class="w"> </span><span class="nn">matplotlib.pyplot</span><span class="w"> </span><span class="k">as</span><span class="w"> </span><span class="nn">plt</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">numpy</span><span class="w"> </span><span class="kn">import</span> <span class="n">pi</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">sympy</span><span class="w"> </span><span class="k