title: How to draw sine in Python turtle?
body: <p>In the text book, the code can draw <code>sin(x)</code>.</p>
  
  <pre><code>for x in range(-175,176):
         turtle.goto(x,50*math.sin((x/100)*2*math.pi))
  </code></pre>
  
  <p>I don't know why ? why <code>sin(x)</code> is <code>50*math.sin((x/100)*2*math.pi)</code>?</p>