$\frac{d}{dx}\sqrt[4]{\frac{2x+1}{1-3x}}$
$2\cdot3.1416$
$-5^2\:-\:2\:x\:-9\:+\:6$
$\int en\left(a^2+x^2\right)vdu$
$\left(5a+1\right).\left(5a-1\right)$
$7b-3<11$
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