$2 x - 10 x ^ { 2 } + 3 ( 5 x ^ { 2 } - 3 x )$
$\int\frac{x+1}{\left(x^2+x\right)^{-2}}dx$
$\lim_{x\to-2}\left(7x^2-4x^3-7\right)$
$\frac{cos}{sec}$
$\lim_{x\to0}\left(\frac{x^4}{\sqrt{x^4+16}-4}\right)$
$6x^2-6x-1$
$\left(b-c\right)^2,\:b=6\:\:c=4$
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