title: Degrees from triangles
body: <p>On my calculator I typed in 90-sin^-1(Y/X)</p>
  
  <p>Y=6, X=9</p>
  
  <p>I was returned with approximately:</p>
  
  <p>48.71 degrees (which I expected)</p>
  
  <p>But on java it returns:</p>
  
  <p>0.72</p>
  
  <p>I was told to use asin on java... Is that correct?</p>