2.3.26 Gradient and Directional Derivative

Condition: Find a derivative function \ (\ varphi = \ frac {y^{2}} {x}+\ frac {y^{2}} {z}+\ frac {z {2}} {x^{2}} \) at the point \ (a (1.0.1) \) \) \) \) \) \) \) \) \) \) \) \) \) \) \) \) \) \) EC) in the direction \ (\ overrightarrow {a b} \), where \ (b (2.2.3) \).