## Math Problem Statement

## Solution

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## Math Problem Analysis

### Mathematical Concepts

Gradient

Directional Derivatives

Vector Calculus

### Formulas

Directional derivative formula: D_u f = ∇f · u

Gradient: ∇f = (f_x, f_y)

### Theorems

Linear equations system solving

Vector dot product

### Suitable Grade Level

Undergraduate (Calculus I or II)