,"PIAL ,D]IVATIVE
     "<CURLY ;D"> ,EXAMPLES

#A4 ,! "PIAL D]IVATIVE ( ;,V )
  RESPECT TO ;R : IS REPRES5T$
  BY OP5 FRAC;N CURLY ;D ;,V OV]
  CURLY ;D ;R CLOSE FRAC;N IS
  WRITT5 _% ?@D,V/@DR# _:
#B4 ,! SECOND ORD] "PIAL
  D]IVATIVE ( ;F ) RESPECT TO ;X
  & ;Y : IS REPRES5T$ BY OP5
  FRAC;N CURLY ;D SUP]SCRIPT TWO
  BASEL9E ;F OV] CURLY ;D ;X
  CURLY ;D ;Y CLOSE FRAC;N IS
  WRITT5 _% ?@D^2"F/@DX@DY# _:









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