$\left(-14\right)\left(-21\right)$
$-83\cdot86$
$x^2+4x+4=289$
$\frac{d}{dx}3x^2-2xy+5y^2=13$
$\int\left(-6x\left(\sin\left(x^2\right)\right)\right)dx$
$\lim_{x\to\infty}\left(\frac{x^4+2x}{x^2+1}\right)$
$\lim_{x\to0}\left(\frac{4x}{\frac{1}{e^{-x}}}\right)$
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