Exact differential equation.

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Answer:-
An exact differential equation is formed by directly differentiating it's solution without any other process.
   ★ Mdx+Ndy=0, is said to be an exact differential equation if it satisfies the following condition I.e (dM/dy)=(dN/dx)
Where dM/dy denotes the differential co-efficient of M with respect to y keeping x constant and dN/dx,  the differential co-efficient of N with respect to x, keeping y constant.

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