$\left(x^2+xy+y\right)\left(2x-y\right)$
$\int\left(e^{3\cdot x}\cdot cos\left(e^{3\cdot x}\right)\right)dx$
$-c^4-d^4$
$1\frac{1}{4}a^2b^3$
$4+7+2-7-3$
$\frac{2x^2+16x+25}{x+9}$
$\frac{1}{\cot2\theta}+\sec\theta\cos\theta$
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