$ylnydx+xdy=0\:,y\left(1\right)=1$
$2a^4-2a^3$
$\int\frac{\left(x^2-2x+4\right)}{\left(x+2\right)\left(x-3\right)}dx$
$\left(a^2-2b^2\right)\left(a^4-2a^2b^2+4b^4\right)$
$-2x^4+2x^2-4x$
$x=2\left(x^4-9x^2+4x\right)$
$20x^2-20x+25$
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