$\lim_{x\to0}\left(xln\frac{x+3}{x+1}\right)$
$23^23^23^23^23^2^23$
$2y'-sin\left(x\right)-1=0$
$27x^3+81x^2+81x+27$
$-4^8+6x^7+14x^6$
$\int\left(\sec^2\left(\frac{1}{3}x\right)\right)dx$
$49x^2n^4-42b^2n^5$
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