$-81+81a^2$
$\int\left(x^3-2\right)\csc\left(x^4-8x\right)dx$
$\lim_{x\to0}\left(\frac{x}{\ln\left(x\right)}\right)$
$\frac{-3+3x+24y}{3x-12+6y}$
$\frac{900}{1}.\frac{9}{15}$
$-15\:x\:-5$
$c^2+6c+27$
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