$\lim_{x\to-9}\left(\frac{x^2-81}{\sqrt{x}-3}\right)$
$\left(1-\sin\right)\left(1+\tan^2\right)$
$\int_e^{\sqrt{2}}3\left(x^{-2}+x^{-3}-x^{-4}\right)dx$
$\left(x^2-9\right)\left(x+6\right)$
$\left(x^3+1\right)\ln\left(x\right)$
$\left(2ab+2\right)^4$
$\left(a+\frac{3}{7}b\right)^2$
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