What is expand (x-y-1)dx+(4y+x-1)dy ?

The solution to expand (x-y-1)dx+(4y+x-1)dy is xdx-ydx-dx+4ydy+xdy-dy

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expand (x-y-1)dx+(4y+x-1)dy

expand

(x - y - 1) d x + (4 y + x - 1) d y

x d x - y d x - d x + 4 y d y + x d y - d y

Solution steps

(x - y - 1) d x + (4 y + x - 1) d y

Expand

d x (x - y - 1) : x d x - y d x - d x

= x d x - y d x - d x + (4 y + x - 1) d y

Expand

d y (4 y + x - 1) : 4 y d y + x d y - d y

= x d x - y d x - d x + 4 y d y + x d y - d y

\frac{8 x + 4}{( 1 - x ) ( x + 2 )}

- sin (π t) (u (t - 1))

- 2^{2}

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

- 3 cos ((2 x^{3} + 2)^{3})

What is expand (x-y-1)dx+(4y+x-1)dy ?
The solution to expand (x-y-1)dx+(4y+x-1)dy is xdx-ydx-dx+4ydy+xdy-dy