Exact equations & integrating factors

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Show that the following equation is exact or can be made exact, hence solve it: $$(\cos^2x+y\sin2x)y'+y^2=0$$ Here, $M=y^2$ and $N=(\cos^2x+y\sin2x)$ $$M_y=2y$$ $$N_x=-2\cos x \sin x +2y\cos 2x$$ After this I can't understand how to find the Integrating factor. Please help.