704 of 1,000 players

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

cone

[13]Natural🇺🇸

1,661 / 4,000 XP into level 13. Playing since September 2026.

Levels: #6
Sprint: #3
Curve Sprint: #6
Diverge: #5

League

Delta

2 promotions · 3 weeks played

cone Squiggles

65

Area Under the Curve · 5/36 collected

Vector Vole

Plus C

Little Delta

Null Set

1day streak, best of 17.

Badges

21 of 58

✎⌒∿≡≈△Σ⌛↑↑≫▲∅⊚↓»⋙⇓⊤⚑✹

Stats

Problems solved: 668
Time played: 9h 31m

Best Sprint: 25
Deepest solved: d20
Runs finished: 48
Clean Sprints: 3
Best Curve Sprint: 5
Curves named: 5
Curves named: 3

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think you can beat cone?

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)