$800\cot\left(18.3\right)+800\cot\left(12.59\right)$
$x-6=12$
$\left(5x+76\right)^2$
$\frac{u^2-3u}{7}=0$
$8ab^2-4a^2b+4a^2b^2$
$\sec^2\left(-\theta\right)-1=tan^2\left(\theta\right)$
$\left(x^{12}-5y^2\right)^2$
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