$\frac{cscx-sinx}{cos^2x}=cscx$
$\left(2pq^3-5p^4q^2\right)^2$
$\int\frac{\sqrt{1+t}}{t}dt$
$\left(y^3-12\right)\left(y^3-9\right)$
$4x^2-20x+35$
$25+7x=8x+15$
$\int\left(\frac{9}{u^2}\right)du$
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