$x^4-256$
$\int\frac{e^{-x}}{5-3e^{-x}}dx$
$2x\le\frac{4}{5}$
$x^4-6x$
$18+\left|13+4-\left(5-7\right)+6\right|$
$18.2\cdot5.1$
$\frac{\tan\left(x\right)^2}{\sec\left(x\right)+1}$
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