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15 bytes added ,  15:53, July 2, 2008
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<math>
 
<math>
−
*dx = dy
+
*dx = dy  
 +
</math>
 +
<math>
 
*dy = -dx
 
*dy = -dx
 
</math>
 
</math>
−
   
and in general
 
and in general
  
81

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