$f\left(x\right)=\frac{1}{2}\ln\left(\frac{1+x}{1-x}\right)$
$2x^2+x^2+2x$
$-5x^2\cdot3x^3+2x^2-3x+4$
$x2-20x+100$
$\left(2x+5y\right)\left(2x-5z\right)$
$\lim_{x\to\infty}\left(\left(\frac{x+3}{x+2}\right)^{2x+1}\right)$
$\int\frac{1}{x^2\left(1+2x\right)}dx$
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