$3.)$ Consider the differential equation

$(4xy5y^3)(-4x^2-2y^3)y^{\text{'}}=0$

i$)$ Show that the given differential equation is not exact.

ii$)$ Find the integrating factor

$.$

iii$)$ Show that the differential equation is exact when multiplied by the integrating factor $$ and use the fact to find the general solution of the differential equation.