704 of 1,000 players

Curve Sprint is unlocked. 296 more to head-to-head Battles.

bccfcc

[30]Natural🇦🇺

3,542 / 4,000 XP into level 30. Playing since September 2026.

Levels: #2
Sprint: #1
Curve Sprint: #1
Diverge: #4

League

Tangent

3 promotions · 3 weeks played

bccfcc Squiggles

2,605

Area Under the Curve · 30/36 collected

Lemniscat

Euler’s Egret

e-lephant

Integral Eel

11day streak, best of 11.

Badges

24 of 58

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Stats

Problems solved: 1,884
Time played: 9h 12m

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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)