$\lim_{x\to-\infty}\left(\frac{2x^4}{3x^3-4}\right)$
$2\sin x+3=\sin x$
$\lim_{x\to-3}\left(\frac{t^2-9}{t+3}\right)$
$y'\:=-\frac{y}{x}+\frac{1}{x^2}$
$\left(4x+2\right)^5$
$\lim_{x\to0}\left(\frac{\sin\left(5x\right)}{\sin x}\right)$
$\left(-1\right)\cdot12$
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