The differential equation (x + y)dx + xd...

The differential equation `(x + y)dx + xdy=0` is

A

(a) `x^2+y^2=c`

B

(b) `2x^2-y^2=c`

C

(c) `x^2+2xy=c `

D

(d) `y^2+2xy=c`

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The correct Answer is:

C

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