$3x^2-75\ge0$
$\int\frac{1}{t^2+\frac{4}{9}}dt$
$5x-7\le7x-1$
$\frac{4x^2+4x+7}{x^2+1}$
$9x^{3}+24x^{2}+13x+2+2x+3$
$\int\frac{4x}{5+2x+x^2}dx$
$4mn\:+\:5mn$
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