$\frac{x^{4}}{x^{4}y^{-2}y^{4}}$
$\lim_{x\to-1}\left(\frac{x^2-3x-4}{x^2+2x+1}\right)$
$\frac{4u^2\:\left(-2\right)^6\:v^2}{4u\:\left(-2\right)^2\:v^2}$
$\int_0^t\left(\sqrt{1+e^{2x}}\right)dx$
$3x^5-3x-5x^4+5$
$2a^3+6a^2-4a$
$-y+8\left(-5y-2\right)$
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