$\lim_{x\to0}\left(\frac{1+\cos\left(x\right)}{x^2}\right)$
$f\left(x\right)=e^{2x-x^2}$
$-x^2-5x+6=0$
$x^2-9x-10=30$
$\int2x\cdot tan^{-1}\left(5x\right)dx$
$\left(6-2d\right)^3$
$x^2+20x-9$
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