$\frac{dy}{dx}=-\frac{\left(y^2+y\right)}{x}$
$\left(a\:-\:2\right)\left(a\:+\:12\right)$
$1-0.09a^2$
$2\cdot\frac{1}{2}\cdot1+6\left(3^2+4^2\right)-4\cdot5^2$
$sec-tan$
$\left(-5\right)+\left(2\right)+\left(1\right)+\left(20\right)+\left(11\right)$
$\log_b\left(x\right)=\frac{2}{3}\log_b\left(27\right)+2\log_b\left(2\right)-\log_b\left(3\right)$
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