$\lim_{x\to0}\left(\frac{n^3-1}{n^4+3}\right)$
$\lim_{x\to a}\frac{senx-sena}{a-x}$
$\int12\left(x^4+4x^2+7\right)^2\left(x^3+2x\right)dx$
$\left(\frac{1}{2}+3x^2\right)^3$
$\frac{d}{dx}y=4xe^{2x}$
$\int2e^{2x+3}dx$
$\left(x+4\right)\left(x^2+4x+4\right)$
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