$\tan u\cdot\csc^2u-\cot u\cdot\sec^2u$
$\left(\frac{5}{6}x-\frac{3}{7}\right)\left(\frac{5}{6}x+\frac{3}{7}\right)$
$3^2-9x$
$\left(y^2+2\right)\frac{dy}{dx}=5y$
$12x^3y^3\left(-12x^2y^3\right)$
$4>3x+5$
$75x^4-125x^2$
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