$2x^2-20x+43$
$cos^2\left(-3x+6\right)^2$
$-19.\left(-6-9\right)$
$\lim_{x\to\infty}\left(\frac{8x^3-5x^2-3}{4x^3+x^2+x-1}\right)$
$\frac{6}{\cos\left(x\right)^2}-6\tan\left(x\right)^2$
$\lim_{x\to-5}\frac{x^2+7x+10}{x^2+3x+40}$
$x^2+35x+4=0$
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