Question:
Mark $(\sqrt{)}$ against the correct answer in the following:
The general solution of the DE $2 x y d y+\left(x^{2}-y^{2}\right) d x=0$ is
A. $x^{2}+y^{2}=\mathrm{C} x$
B. $x^{2}+y^{2}=C y$
C. $x^{2}+y^{2}=C$
D. None of these
Solution:
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