$\frac{3a^2b}{6a^2}$
$x2+\frac{x^2}{3}$
$\frac{6s^8-10s^6+12s^4}{-2s^3}$
$137,27\:-16,298$
$\frac{\tan a-\cot a}{\tan a+\cot a}=1-2\cos^2a$
$3x^2+18x+34=4$
$\frac{x^4-1x-1}{x-1}$
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