2.4 Lösning 4c

\( y = {2 \over 3}\,x\,\sqrt{x} - {1 \over x^2} = {2 \over 3}\,x\cdot x^{1 \over 2} - {1 \over x^2} = {2 \over 3}\, x^{1+{1 \over 2}} - {1 \over x^2} = {2 \over 3}\, x^{3 \over 2} - {1 \over x^2} = \)