$x^2-8x-19=0$
$\int\cot^6\left(5x\right)dx$
$\frac{1+\sec^2x}{\sec^2x}$
$\left(3x+5y-z\right)\left(3x+5y-z\right)$
$-\frac{e^{-1^2}}{2}$
$9k^{-\frac{1}{4}}$
$12x^2y+16x^2y$
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