$2\left(x+3\right)-7x$
$\frac{\left(cot\left(x\right)-tan\left(x\right)\right)}{\left(cot\left(x\right)+tan\left(x\right)\right)}\:=2cos^2\left(x\right)-1$
$\left(7a^2+2b\right)\left(7a^2-2b\right)$
$\int\left(\frac{r}{\sqrt{16-9r^4}}\right)dr$
$m^2+9m+14$
$\int\left(\frac{\sqrt{1-x}}{x^2}\right)dx$
$\tan\left(x\right)\cot\left(x\right)\cos\left(x\right)$
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