What is expand xdy+ydx+xy(3dx+dy) ?

The solution to expand xdy+ydx+xy(3dx+dy) is xdy+ydx+3xydx+xydy

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expand xdy+ydx+xy(3dx+dy)

expand

x d y + y d x + x y (3 d x + d y)

x d y + y d x + 3 x y d x + x y d y

Solution steps

x d y + y d x + x y (3 d x + d y)

Expand

x y (3 d x + d y) : 3 x y d x + x y d y

= x d y + y d x + 3 x y d x + x y d y

[\frac{1}{s ( s ^{2} + 4 )}]

2 (n^{2} + 1) \frac{d m}{d n}

(2, 0, - 1) \cdot (1, - 2, 4)^{'}

(\frac{600 ( 520 - x )}{( x )}) - 345

+ 1 - (x + 4 y^{2}) \cdot d y + d y d x

What is expand xdy+ydx+xy(3dx+dy) ?
The solution to expand xdy+ydx+xy(3dx+dy) is xdy+ydx+3xydx+xydy