$4b-3b-2b$
$n^2-81$
$\frac{2}{\cos\left(2x\right)}$
$-2x^5y^9-2x^6y^6$
$\int10x^4\cdot cos\left(x^5\right)$
$\left(-x^3y^2\right)\left(xy^3\right)$
$\pi\int_{\frac{\pi}{2}}^{\pi}\left(9sin\left(x\right)\right)dx$
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