$\frac{x^4+16}{x-2}$
$cos^2x-sin^2x=1$
$\frac{x}{x^2+5x+6}$
$\frac{x-2}{5}-1=0$
$\left(\frac{6\sqrt{5}}{7}+3b+7\right)^{2}$
$-x^2-x-2$
$\left(-63\right)-\left(-27\right)-79$
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