$5x\:+11=21$
$\lim_{x\to\infty}\left(e^{-x^2+\sqrt{x^2-4x}}\right)$
$0=e^{4cosx}$
$\int x^2\left(x^2-10000\right)dx$
$\lim_{x\to2}\left(x^2-15\right)$
$\left(x^2\right)^n\:.\left(x^2\right)^3$
$\lim_{x\to1}\left(\frac{x-1}{x^2+x-24}\right)$
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