$\frac{8x^2+22x-21}{2x-7}$
$2-5\cdot7$
$b-5>-4$
$cos\left(x\right)tan2\left(x\right)sec\left(x\right)+1$
$\sqrt{\sqrt[3]{0.000064}}$
$\lim_{x\to\pi}\left(\frac{\left(x-\pi\right)\cos\left(\frac{3\pi}{2}-x\right)}{\sec\left(x-\pi\right)-1}\right)$
$12x-4\le12x-6$
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