2.4 Lösning 3e
Från Mathonline
\[ y = {1 \over x^2} = x^{-2} \]
\[ y\,' = (-2)\cdot x^{-2-1} = (-2)\cdot x^{-3} = (-2)\cdot {1 \over x^3} = -\,{2 \over x^3} \]
\[ y = {1 \over x^2} = x^{-2} \]
\[ y\,' = (-2)\cdot x^{-2-1} = (-2)\cdot x^{-3} = (-2)\cdot {1 \over x^3} = -\,{2 \over x^3} \]