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  1. $pi = 3.14159265358979
  2. $x = sin($pi / 4)  ;returns 0.707106781186547 which you should recognize as sqrt(2)/2
  3.  
  4. $degToRad = $pi / 180
  5. $y = Sin(90 * $degToRad)  ;sine of 90░
  6.