undefinedcritter

[2]Natural🇸🇬

1,177 / 4,000 XP into level 2. Playing since September 2026.

League

Delta

1 promotion · 2 weeks played

undefinedcritter Squiggles

Area Under the Curve · 0/36 collected

No Squiggles yet.

1day streak, best of 6.

Badges

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Today's problem

\frac{d}{d x} [- 4 x - \frac{5}{x ^{2}}]

The hard one · double XP

For f (x, y) = 4 x^{2} + 2 x y^{2} - 11 y^{2}, find f_{xx} f_{y y} - (f_{x y})^{2} at (0, 2)