Question

differentiate: -pir^2/2

Answer 1

\[\frac{d}{d r}(-\pi r^2/2)?\]

Answer 2

yes

Answer 3

Well just apply the power rule
\[\large \frac{d}{dx}(x^n)= nx^{n-1}\]

Answer 4

You get
\[\frac{d}{d r}(\frac{-\pi r^2}{2}) =-\frac{2\pi r}{2}=-\pi r\]

Answer 5

ok thanks