$\left(8a+9\right)\left(8a-6\right)$
$20+900$
$\int\frac{\left(9x^2+7x-6\right)}{x^3-x}dx$
$lny=-ln\left(cos\left(x\right)\right)$
$\frac{dy}{dx}=\frac{\left(y^2-x^2\right)}{xy}$
$3+\frac{x}{2}\ge5x$
$7\cdot2-2\cdot3$
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