$\left(x^4+3x^3+6\right)\left(2x-1\right)$
$3x-1\le7$
$\tan^22x-3=0$
$\left(13a\right)\left(6a+9\right)$
$\frac{17}{0.37}$
$\int\frac{x^4-7x^2+4}{x^3-4x}dx$
$126^{\circ}-l=180^{\circ}$
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