$\lim_{x\to0}\left(\frac{3x^2-4x}{x}\right)$
$x^4+2x^3+x^8$
$30x^2-6x-12$
$7x^3+56$
$\frac{1+tan^2\left(x\right)}{cos^2\left(x\right)}$
$\frac{1}{2}x+x$
$\frac{du}{dt}=6u+5e^{2t}$
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