and an uncertain angle in which we see the top of it. For example: <code>100 x tan(70 ~ 80)</code></li>
      <li>Estimate return on investment of a marketing campaign, given an uncertain number of views, uncertain click through rate, uncertain conversion rate, and uncertain spend. For example: <code>1000000 x (2~3 / 100) x (3~5 / 100) x (10~15)</code></li>
    </ul>

    <h2>Available functions</h2>
    <p>In the keypad above, you will only find <code>+</code>, <code>-</code>, <code>x</code> and <code>/</c