$\left(a^2b-9\right)\left(a^2b+9\right)$
$\left(x^2+1\right)\cdot cos2x$
$\:f\left(x\right)=5+log\left(x^2-2x+1\right)$
$\int\frac{\sqrt{x^2-a}}{x^4}dx$
$\int\left(8tanx-9sec^2x+8secxtanx\right)dx$
$2\sqrt{3451^2}$
$\frac{dy}{dx}-y\sin\left(x\right)=0$
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