5m Zen
X dy dx 2y 4x 2
X dy dx 2y 4x 2 pictures 5
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X dy dx 2y
X dy dx 2y 4x 2
x 2 d 2y dx 2 4x dy dx 2y ex
2 x 3y 1 dy dx 4x 2y 1
2y 2 2y 4x 2 dx 2xy x dy 0
x dy dx 2y 4x 2
