title: Variation of an arcsin
body: <p>How to make a variation in a arcsin?</p>
  
  <p>I am doing </p>
  
  <pre><code>q1=np.linspace(0, 90, 91)
  n1=1
  n2=1.5
  q2=math.asin(n1*sin(q1)/n2)
  </code></pre>
  
  <p>But it is not working.</p>