$\lim_{x\to0}\left(\frac{\ln\left(x+2\right)}{x^2+5x+4}\right)$
$2\left(sinx+cosx\right)^2$
$\frac{7}{2-4x}$
$-7\cdot x<7$
$2x-5\cdot5x-1$
$-5+\left(-4\frac{1}{2}\right)$
$\int\frac{20}{x^2-13x+36}dx$
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