$\lim_{x\to0}\left(\frac{ln\left(1-2x\right)}{cos\left(x\right)}\right)$
$4-3x\ge x+6$
$cot\left(\frac{\pi\:}{2}-x\right)cscx=secx$
$140\cdot5$
$\frac{4^2}{4^{-8}}$
$2.\left(-1\right)-3.\left(2\right)$
$3f^2-2f=1$
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