$\int\:\left(2x^2+x\right)lnxdx$
$\frac{d^2y}{d^2x}y=8x^4+3x^2-\frac{7}{x}$
$9x^6-81x^2y^4$
$xy=y+\sqrt{y^2-x^2}$
$x^2-15x+255$
$\left(2x-5\right)\left(2x-9\right)$
$\int\frac{\left(x^2-2\right)\left(x^2+2\right)}{4x^3}dx$
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