$5^2+30$
$\lim_{x\to2}\left(\frac{x^2-8}{x^4-16}\right)$
$\left(-2x^2-2y^6\right)^2$
$3x^{17}+30x^9+75x$
$log\:\left(\frac{a}{b}\right)=-m$
$\tan^2x+5=\sec^2x+4$
$\frac{9.7^7}{9.7^3}$
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