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Previous Year Question (PYQs)

An integrating factor for $(\cos y \sin 2x)dx + (\cos^2 y - \cos^2 x)dy = 0$




Solution

Using standard form and checking $\frac{\partial M}{\partial y} - \frac{\partial N}{\partial x}$ Integrating factor becomes $\frac{1}{\tan^2 y + \sec y \tan y}$

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