$\frac{2^2-x^2}{2+x}$
$4-3+54-20+8-9$
$\sqrt[3]{\sqrt{12x-1\ge0}}$
$\left(\sqrt{2}x^6\right)^2$
$\log_{49}343l$
$\cot\left(\theta\:\right).\tan\left(\theta\:\right)$
$\frac{\cos\left(x\right)}{\sec\left(x\right)-1}$
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