title: Python3 "math.sin" function returning incorrect result (the angle is in radians.)
body: <pre><code>
  &gt;&gt;&gt; import math
  &gt;&gt;&gt; math.sin(math.radians(180))
  1.2246467991473532e-16
  &gt;&gt;&gt; 
  </code></pre>
  <p>Isn't the sine of 180º 0.0?</p>