$tga\:+\:tgb\:=\:\frac{sin\left(a+b\right)}{cosa\:cosb}$
$a^{a-b-b}$
$\left(p+9\right)\left(p-12\right)$
$\int\frac{s}{\left(s^2+16\right)\left(s^2+6s+9\right)}ds$
$\left(ab-2c\right)^3$
$\left(1-x\right)\left(-1-x\right)\left(-2-x\right)+2$
$\int\frac{3x^2-2x+1}{\left(x^2+1\right)\left(x+2\right)^2}dx$
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