$9a\cdot2a^3$
$+7\:+\left(-5\right):\left(-7+2\right)\:-\:\left(+1-6\right)\:$
$\left(x-7\right)\left(x-20\right)$
$\frac{\sec^2a-1}{\sec^2a}$
$\int^44x^3dx$
$49-\left(-44\right)$
$\sqrt{4^{-2x+6}}$
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