,"PIAL ,DERIVATIVE
      7CURLY ;D7 ,EXAMPLES

#1_4 ,! "PIAL DERIVATIVE ( ;,V )
  RESPECT 6;R : IS REPRES5T$
  0OP5 FRAC;N CURLY ;D ;,V OV]
  CURLY ;D ;R CLOSE FRAC;N IS
  WRITT5 ?@D,V/@DR#
#2_4 ,! SECOND ORD] "PIAL
  DERIVATIVE ( ;F ) RESPECT 6;X
  & ;Y : IS REPRES5T$ 0OP5
  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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