$\int x^2\cdot ln\sqrt{x}dx$
$\frac{9}{\cos^2\left(x\right)}-9\tan^2\left(x\right)$
$\int\frac{x^5}{\sqrt{x^2+4}}dx$
$6a^2+24xy+24y^2$
$2\left(x+c\right)+7\left(x+d\right)$
$5y+7+x-5+4x+3y$
$\left(-1-9m^2n\right)\left(9m^2n+1\right)$
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