$3x^2-5x+3x^3-4x^2+2x+4x^3$
$15ax+35ax^2+25x^3-5x$
$\lim_{x\to\infty}\left(\frac{e^x+1}{e^x-1}\right)$
$\left(2b-3\right)^3$
$\int\frac{3x+2}{\left(3x^2+4x\right)^4}dx$
$\int\frac{1}{8\left(x^2+16\right)}dx$
$a^3-4a^2+6a-4$
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