SamverkanFlervariabelanalysLIU

a) \displaystyle f_{x_{1}}=\frac{x_{1}}{|\mathbf{x}|}, \displaystyle f_{x_{2}}=\frac{x_{2}}{|\mathbf{x}|}, \displaystyle f_{x_{3}}=\frac{x_{3}}{|\mathbf{x}|}

b) \displaystyle f_{x_{1}}=2x_{1}, \displaystyle f_{x_{2}}=2x_{2}, \displaystyle f_{x_{3}}=2x_{3}