$\left(a^2+6y\right)\left(a^2-4x\right)$
$1-20\cdot2$
$\frac{dy}{dx}-5y^{-1}e^{2x}=0$
$27m^2+72mn+48n^2$
$\frac{\left(-5\right)^6}{\left(-5\right)^3}$
$cos\:r=\:\frac{1}{5}$
$\int\frac{3x-11}{x^2+3x-4}dx$
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