5m Zen
X 3y 2 )( xy 4
X 3y 2 )( xy 4 pictures 5
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X 3y
X 3y 2 )( xy 4
xy 2 x 3y 4 0
4 xy )- 3y 2 yx )+ x
x 2 xy 2x 3y 4 0
x 3y 2 x 2y 3 xy 4 xy
x y )( xy )+( xy 4 x 3y 2 xy 2
dy dx 4 xy x 3y 2
x 3y 2 )( xy 4
