$12-\left(9+6\right)$
$\left(x^{8}-x^{6}+x^{4}-x^{2}+1\right):\left(x-2\right)$
$\int\sec4\left(8x\right)dx$
$2x^2-5x+1=0$
$\frac{5x-1}{x-7}>7$
$\frac{d^{12}}{d^4}$
$5x^2-16x+3$
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