$-7a^3+21a^2-14a$
$b^m\cdot b^n$
$18a^3+12a^2-15a-10$
$9x^2+6x-1$
$\lim_{x\to0}\left(\frac{1}{\left(tan\left(x\right)^{-1}\right)^2}\right)$
$12-4\cdot5-15+\left(-15\right)$
$\frac{\left(x^5\right)}{\left(2-x^2\right)}$
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