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df / dx = 2 * 2x * y = 4xy
df / dy = 2 * x² * 1 = 2x²
Zatem gradient wynosi:
[df/dx, df/dy] = [4xy, 2x²]
2 * 2x * y = 4xy
2 * x² * 1 = 2x²
gradient: [df/dx, df/dy] = [4xy, 2x²]