$2x^4+x^2$
$\frac{x^2-4}{x^3-10}$
$\left(x^2+9\right)^8=0$
$\frac{sec^2a-1}{sina}=tana$
$35m^2n^3-70gn^3$
$-1+7-2+1$
$\lim_{x\to\infty}n^{.01}$
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