$\int-\frac{9}{7}x^{-6}dx$
$\lim\:_{x\to\:3}\left(\frac{x^2+27}{4x+24}\right)$
$\left(-5a^2\right)\cdot3a$
$8a^3-4ab-20a^2+10b^3$
$4x^2+4x-27\ge0$
$\left(3a^{x+2y}+3b^{3x-1}\:\right)\left(3a^{x+2y}-3b^{3x-1}\:\right)$
$\int\frac{x^2+2x-1}{\left(x-1\right)\left(x^2+9\right)}dx$
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