$\lim_{x\to0}\left(\frac{2x^2+7x}{e^x}\right)$
$36-25\left(x-4\right)^2$
$2ax-3ay$
$\int_0^1\left(6x^2e^{x^3}\right)dx$
$\int\:\:x\left(x+3\right)^6dx$
$5n+4+9n-2$
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