2.4 Lösning 4a

\[ y = {x^2 + 3 \over x} = {x^2 \over x} + {3 \over x} = x + {3 \over x} = x + 3\cdot {1 \over x} \]

\[ y\,' = 1 + 3\cdot \left(-{1 \over x^2}\right) = 1 - 3\cdot {1 \over x^2} = 1 - {3 \over x^2} \]