Matematyka
$f\left(r\right) =$ | ${3}^{r}$ |
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$\dfrac{\mathrm{d}\left(f\left(r\right)\right)}{\mathrm{d}x} =$ |
$\class{steps-node}{\cssId{steps-node-1}{\tfrac{\mathrm{d}}{\mathrm{d}x}\kern-.25em\left({3}^{r}\right)}}$ $=\class{steps-node}{\cssId{steps-node-2}{0}}$ |