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- f[r_] := {r, 0, 2*Pi}
- a = r;
- b = r^2;
- F = a^2 + b^2;
- F1 = Dt[F];
- D[F1, r]
- 2 r !(*SubscriptBox[([PartialD]), (r)](Dt[r])) + 4 r^3 !(*SubscriptBox[([PartialD]), (r)](Dt[r])) + 2 Dt[r] + 12 r^2 Dt[r]
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