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Consider the following two statements:

Assertion (A): The differential equation (ey – 4) xdx – cos xdy = 0 is not exact.
Reason (R): The differential equation Mdx + Ndy = 0 is exact if .
The correct option is

 
Both A and R individually true and R is the correct explanation of A.
Both A and R individually true but R is not the correct explanation of A.
A is true, but R is false.
A is false, but R is true.

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Question was wrong sir