We have:
$$(\tan X - \sin X \sin V) \, dx + (\cos X \cos V) \, dv = 0$$
We can rewrite this as:
$$M(X, V) \, dx + N(X, V) \, dv = 0$$
Where $M(X, V) = \tan X - \sin X \sin V$ and $N(X, V) = \cos X \cos V$. To check if the equation is exact, we need to verify
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