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Please answer this:2+2 =

Original Message (ID '144592') By yehdua:
Following my last post If you will start to be comfortable with such manipulations you can later try D[L1 L2, x, NonConstants -> {L1 , L2}] /. MapThread[ HoldPattern[D[#1, x, ___]] :> D[#2, x] &, {{L1, L2}, {l1, l2}}] and this can be generalized further... yehuda