2.3.30 Gradient and directional derivative
\( \underline{\text { Condition: }} \) Find the gradient of the function \[ f(x, y, z)=\frac{x^{2}+2 y}{2 y+z} \text { at point } A(2; 4; 2) \text {. } \]
Calculation of the gradient and derivative in a given direction of functions of several variables.