$\left(9x^2+3x-40\right)\left(9x^2+12x+4\right)$
$\left(15-3\cdot6\right)$
$\frac{2}{x}=x-1$
$\frac{\cot\left(4x\right)}{\cot\left(3x\right)}$
$x^6-y^{18}$
$\int\frac{cos\left(x\right)}{x^2}dx$
$\int_0^78.3e^{-.029x}dx$
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