$\left(f+g\right)\left(x\right)f\left(x\right)=3xg\left(x\right)=-x^2-4x$
$\lim_{x\to\infty}\left(-\frac{1}{1+\frac{\sqrt{x^2+x}}{x}}\right)$
$\frac{x^3-5x^2+3x^2-2}{x+1}$
$a-2\left(2a+b\right)+3\left(3a-2\right)$
$\lim_{x\to0}\left(\frac{2-\left(e^x+e^{-x}\right)\cos x}{x^4}\right)$
$y^2-7y+7y-49$
$\int\left(t\:sen\:mt\right)dx$
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