$\left(a^2+ab\right)\left(-2ab+b^2\right)$
$8^{-a}+5;\:a=-6$
$2x+hx-x^2$
$\frac{8a^9+y^9}{2a^3+y^3}$
$\lim_{x\to0}\left(\frac{sinx}{2^x-1}\right)$
$2\left(x+1\right)+x-7=2x-2$
$\int\left(2x+2\right)\left(x^2+2x+1\right)^6dx$
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