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Question Number 142408 by mohammad17 last updated on 31/May/21

Commented by mohammad17 last updated on 31/May/21

$$??????$$

Answered by qaz last updated on 31/May/21

$$\frac{\partial \mathrm{w}}{\partial \mathrm{r}}=\frac{\partial }{\partial \mathrm{r}}(\mathrm{x}+2\mathrm{y}+{\mathrm{z}}^2)=\frac{\partial \mathrm{x}}{\partial \mathrm{r}}+2\frac{\partial \mathrm{y}}{\partial \mathrm{r}}+\frac{\partial \left({\mathrm{z}}^2\right)}{\partial \mathrm{r}}=\frac{\partial \mathrm{x}}{\partial \mathrm{r}}+2\frac{\partial \mathrm{y}}{\partial \mathrm{r}}+2\mathrm{z}\frac{\partial \mathrm{z}}{\partial \mathrm{r}}=\frac{1}{\mathrm{s}}+4\mathrm{r}+8\mathrm{r}$$$$\mathrm{same}.....\frac{\partial \mathrm{w}}{\partial \mathrm{s}}=-\frac{\mathrm{r}}{{\mathrm{s}}^2}+\frac{1}{\mathrm{s}}$$

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