$\frac{x^3+x}{1-x^2}$
$\tan^2\left(x\right)-3\sin\left(x\right)\tan\left(x\right)\sec\left(x\right)$
$a^2b-a^2b-3a^2$
$\sqrt[3]{81b^7}$
$f\left(x\right)=\frac{3x-1}{x^2-x-6}$
$\sqrt[6]{745-16}$
$\frac{20x^4}{-5}$
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