$\left(-6+5b\right)^3$
$-3\cdot6-\left(-5\right)$
$\int\frac{x^3}{4+x^2}dx$
$16p^4-81q^4$
$\lim_{x\to3}\frac{x+2}{x-3}$
$\frac{1-tan^2x}{1+tan^2x}+1\:=\:2cos^2x$
$\int\left(1+2x^2\right)^3\cdot4x$
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