$\left(2p+3q\right)^2-\left(2p-3q\right)^2$
$a\left(x-1\right)^2$
$4\:sin^2x+8cos\:x-7=0$
$3x^2+12x+5=0$
$9ab-15ab$
$\frac{20a^8b^2}{4a^2b}$
$\int\frac{4x^2-x+3}{x}dx$
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