$8xy^2-3xy^2$
$x\frac{dy}{dx}-y=x^3\sin x$
$\frac{4\cot x}{1+\cot^2}$
$\frac{x^4-x^2-6}{x^2+2}$
$2x^2-8x+16$
$\lim_{x\to infinity}\left(\frac{n}{a^n}\right)$
$-6x^2+25x^2$
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