$\left(x+4\right)^{2}-\left(x-1\right)^{2}$
$\frac{c^3+12c^3+34c+8}{c+4}$
$6\sec x^2$
$x^2-54x+112$
$3x-12x^2-9x$
$\frac{-f}{3}^2$
$\lim_{x\to0}\left(\frac{1}{cosx-1}\right)$
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