$\frac{16x^2-13x^3+2x^4-9x+20}{x-5}$
$x\sqrt{y^2+1}dx=y\sqrt{x^2+1}dy$
$\int\left(\frac{\left(lnx\right)^7}{x}\right)dx$
$\int\frac{x-3}{\left(x-3\right)^2-1}dx$
$\frac{4x^2-9}{x+3}$
$\left(\frac{t-2}{4-2}\cdot\frac{t-2.5}{4-2.5}\right)$
$8x^2-y^2=1$
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