Leagues

Ten players, one week. The top of each group moves up on Monday, and fewer go up the higher you climb.

This week ends in6d 17hResults and new groups at midnight UTC, Sunday into Monday.

Tangent

Touching the curve, finally.

1 player, 1 group. Top 3 of each group go up, bottom 2 drop.

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)