$\lim_{x\to a}\left(\frac{3x^2-4x-11}{2x+1}\right)$
$4\left(x+4\right)=6x+22$
$\left(x^2+\:5x\:+\:1\right)\:\:\left(x\:-\:1\right)$
$\sin\left(\frac{2}{n\sqrt{n}}\right)$
$x''-7x'+12x=0$
$-3+4+10-7-5+12-16+13$
$-sin\left(-x\right)+csc\left(-x\right)$
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