$\lim_{r\to0}\left(2r^r\right)$
$\left(4x-2y\right)\left(4x+2y\right)$
$5\left(x+2\right)-7\left(x-2\right)=256$
$\lim_{x\to\infty}\left(-\frac{1}{3}\right)^x$
$4b-9-7-5b$
$\int2e^{2x}\cdot\left(e^{2x}+4\right)^5$
$y'=-\frac{\sqrt{x}}{4y}$
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