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<p>angle between the two vectors </p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">vec1</td><td>cartesian vector </td></tr>
    <tr><td class="paramname">vec2</td><td>cartesian vector </td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>unit vector in x direction </dd></dl>

</div>
</div>
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