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# I am missing something here:

I am missing something here:

Could you please show or explain the step between D = av^2 + (b/v^3) and where D' = 2av - (2b / v^3)

I am using the exponent rule to arrive at 2av, however when I use the quotient rule for (b/v^3) I get the wrong outcome.

Appreciate your time.