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					     i    i 1 i 2    i(                )                       i
                                                      z  r e z  r (cos  i sin  ) exp(i )
    e e e                e        1       2




                                                  i
                                                  e     cos  i sin 




                                                      i        i
                                                  e e
zz
1    2                                             
          (cos  i sin  )(cos  i sin  )  cos(   )  i sin(   )
                 1                    2                    2               2   1   2             1   2




                             1           1 i (  ) 1 i i  1
                         z                 e  r e e  i
                                          r                    e

				
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