$81a^2-64b^2\cdot81a^2-64b^2$
$e^y=0$
$\int\left(\cos\left(\arccos\left(2x\right)\right)\right)dx$
$\left(13a+11b\right)\left(13a-11b\right)$
$\int\left(\sqrt{x}ln\left(4x\right)\right)dx$
$\int\frac{r^3-3r^2-9r+2}{r+2}dr$
$\frac{1}{4}am-2+\frac{1}{2}am-1$
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