$\left(\frac{sin\left(x^2\right)}{1-\cos\left(2x\right)}\right)$
$\left(x^2-xy\right)\left(x^3+x^2y\right)$
$tan\left(a-b\right)=\frac{\left(tan\left(a\right)-tan\left(b\right)\right)}{1+tan\left(a\right)tan\left(b\right)}$
$\sqrt[2]{81}\cdot x^8y^4$
$\int_{-3}^{-1}\left(18x\right)dx$
$\left(6x-y\right)\left(6x+y\right)$
$-220+250-200+330+170+140-160$
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