5m Zen
X 1 2 dy
X 1 2 dy pictures 5
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X 1 2 dy
x 3 x 2 x 1 dy dx
1 x 2 dy xydx
4xydx x 2 1 dy 0
1 x 2 dy dx 4x 2 2xy
1 x 2 dy xydx 0
x 2 dx y x 1 dy 0
1 x 2 dy dx xy 1
y x 1 2 dy dx
x 1 2 dy dx
x 1 2 dy dx xe x
